bookmark feature rewrite

apps/weblibre/lib/features/app_links/domain/services/app_link_policy_replication.dart

@@ -82,7 +82,9 @@ AppLinkPolicySnapshot? appLinkPolicySnapshot(Ref ref) {
   final isolationLoaded = ref
       .watch(watchIsolatedContextContainerMapProvider)
       .hasValue;
-  final strictLoaded = ref.watch(watchStrictContextAssignmentsProvider).hasValue;
+  final strictLoaded = ref
+      .watch(watchStrictContextAssignmentsProvider)
+      .hasValue;
   final sitesLoaded = ref.watch(watchAllAssignedSitesProvider).hasValue;
   // The real proxy-routing settings drive `protectGeneralContext`; the
   // `...WithDefaults` view silently substitutes defaults while the row loads,

apps/weblibre/lib/features/app_links/domain/services/app_link_policy_replication.g.dart

@@ -120,7 +120,7 @@ final class AppLinkPolicySnapshotProvider
 }
 
 String _$appLinkPolicySnapshotHash() =>
-    r'7f700b67d3b7b0b435fe82a98de455c6e374a1a2';
+    r'6fe2dca118d7162561fc7f6280d1a0411d50972a';
 
 /// Single serialised writer that mirrors the Dart-owned app-link policy to the
 /// native profile-scoped store (§2.8), the sole policy source consulted by the

apps/weblibre/lib/features/app_links/domain/services/effective_routing.dart

@@ -311,7 +311,10 @@ AppLinkProtection computeAppLinkProtection({
 
   final protectedContextIds = <String>{};
   for (final MapEntry(:key, :value) in assignmentByContextId.entries) {
-    if (isAssignmentProtected(value, protectGeneralContext: protectGeneralContext)) {
+    if (isAssignmentProtected(
+      value,
+      protectGeneralContext: protectGeneralContext,
+    )) {
       protectedContextIds.add(key);
     }
   }
@@ -323,7 +326,10 @@ AppLinkProtection computeAppLinkProtection({
         .toList();
     if (assignments.isEmpty) continue;
     final chosen = resolveIsolationContextRouting(assignments).chosen;
-    if (isAssignmentProtected(chosen, protectGeneralContext: protectGeneralContext)) {
+    if (isAssignmentProtected(
+      chosen,
+      protectGeneralContext: protectGeneralContext,
+    )) {
       protectedContextIds.add(key);
     }
   }

apps/weblibre/lib/features/app_links/presentation/widgets/container_app_link_settings_dialog.dart

@@ -53,17 +53,17 @@ class ContainerAppLinkSettingsDialog extends ConsumerWidget {
     WidgetRef ref,
     ContextAppLinkPolicy Function(ContextAppLinkPolicy current) update,
   ) async {
-    await ref
+    await ref.read(saveGeneralSettingsControllerProvider.notifier).save((
-        .read(saveGeneralSettingsControllerProvider.notifier)
+      current,
-        .save((current) {
+    ) {
-          final existing =
+      final existing =
-              current.appLinkContextOverrides[contextId] ??
+          current.appLinkContextOverrides[contextId] ??
-              ContextAppLinkPolicy.blank();
+          ContextAppLinkPolicy.blank();
-          return current.copyWith.appLinkContextOverrides({
+      return current.copyWith.appLinkContextOverrides({
-            ...current.appLinkContextOverrides,
+        ...current.appLinkContextOverrides,
-            contextId: update(existing),
+        contextId: update(existing),
-          });
+      });
-        });
+    });
   }
 
   @override
@@ -120,7 +120,9 @@ class ContainerAppLinkSettingsDialog extends ConsumerWidget {
                   RadioListTile.adaptive(
                     value: AppLinksMode.ask,
                     title: Text('Ask before opening'),
-                    subtitle: Text('Show a prompt before opening links in apps'),
+                    subtitle: Text(
+                      'Show a prompt before opening links in apps',
+                    ),
                   ),
                   RadioListTile.adaptive(
                     value: AppLinksMode.never,

apps/weblibre/lib/features/geckoview/features/bookmarks/domain/entities/import_bookmark_node.dart

@@ -0,0 +1,135 @@
+/*
+ * Copyright (c) 2024-2026 Fabian Freund.
+ *
+ * This file is part of WebLibre
+ * (see https://weblibre.eu).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/// Parser output for bookmark imports.
+///
+/// This is the hand-off between parsing (which is pure, and runs in a
+/// background isolate) and insertion (which talks to Places). Nodes carry no
+/// guids and no explicit positions: the tree is described purely by nesting and
+/// child order, and storage assigns both while inserting.
+///
+/// Netscape/Firefox metadata that Places cannot represent — `TAGS`,
+/// `SHORTCUTURL`/keyword, `POST_DATA` and `LAST_CHARSET` — is intentionally
+/// dropped during parsing rather than modelled here.
+library;
+
+/// A single node of a parsed bookmark tree.
+sealed class ImportBookmarkNode {
+  /// Creation time recorded in the imported file, or null if it had none.
+  final DateTime? dateAdded;
+
+  /// Modification time recorded in the imported file, or null if it had none.
+  final DateTime? lastModified;
+
+  const ImportBookmarkNode({this.dateAdded, this.lastModified});
+}
+
+/// A folder and everything nested underneath it.
+final class ImportBookmarkFolder extends ImportBookmarkNode {
+  final String title;
+
+  /// Children in the order they should appear under this folder.
+  final List<ImportBookmarkNode> children;
+
+  const ImportBookmarkFolder({
+    required this.title,
+    required this.children,
+    super.dateAdded,
+    super.lastModified,
+  });
+}
+
+/// A bookmark pointing at [url].
+final class ImportBookmarkItem extends ImportBookmarkNode {
+  final Uri url;
+  final String title;
+
+  const ImportBookmarkItem({
+    required this.url,
+    required this.title,
+    super.dateAdded,
+    super.lastModified,
+  });
+}
+
+/// A visual divider between sibling nodes.
+final class ImportBookmarkSeparator extends ImportBookmarkNode {
+  const ImportBookmarkSeparator({super.dateAdded, super.lastModified});
+}
+
+/// What a parser found in a bookmark file, and where it belongs.
+///
+/// [sections] maps the guid of a Places root onto the nodes that should be
+/// appended underneath it. Files without root markers produce a single section;
+/// Firefox exports that identify their menu/toolbar/unfiled roots produce one
+/// section per recognised root.
+class ImportBookmarkTree {
+  final Map<String, List<ImportBookmarkNode>> sections;
+
+  /// Counters describing what the parser saw, including what it discarded.
+  final ImportBookmarkStats stats;
+
+  const ImportBookmarkTree({required this.sections, required this.stats});
+
+  static const empty = ImportBookmarkTree(
+    sections: {},
+    stats: ImportBookmarkStats(),
+  );
+
+  bool get isEmpty => sections.values.every((nodes) => nodes.isEmpty);
+}
+
+/// Summary of a parse, useful for reporting and for regression tests that care
+/// about what was skipped rather than only about what survived.
+class ImportBookmarkStats {
+  /// Bookmark items that parsed successfully.
+  final int bookmarkCount;
+
+  /// Folders that parsed successfully.
+  final int folderCount;
+
+  /// Separators that parsed successfully.
+  final int separatorCount;
+
+  /// Entries dropped because they had no URL, or one that could not be parsed
+  /// or carried no scheme.
+  final int skippedUrlCount;
+
+  const ImportBookmarkStats({
+    this.bookmarkCount = 0,
+    this.folderCount = 0,
+    this.separatorCount = 0,
+    this.skippedUrlCount = 0,
+  });
+
+  ImportBookmarkStats copyWith({
+    int? bookmarkCount,
+    int? folderCount,
+    int? separatorCount,
+    int? skippedUrlCount,
+  }) {
+    return ImportBookmarkStats(
+      bookmarkCount: bookmarkCount ?? this.bookmarkCount,
+      folderCount: folderCount ?? this.folderCount,
+      separatorCount: separatorCount ?? this.separatorCount,
+      skippedUrlCount: skippedUrlCount ?? this.skippedUrlCount,
+    );
+  }
+}

apps/weblibre/lib/features/geckoview/features/bookmarks/domain/providers/bookmarks.dart

@@ -17,125 +17,38 @@
  * You should have received a copy of the GNU Affero General Public License
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
-import 'dart:async';
-
 import 'package:flutter/services.dart';
 import 'package:flutter_mozilla_components/flutter_mozilla_components.dart';
-import 'package:nullability/nullability.dart';
 import 'package:riverpod_annotation/riverpod_annotation.dart';
 import 'package:weblibre/features/geckoview/features/bookmarks/domain/entities/bookmark_item.dart';
 import 'package:weblibre/features/geckoview/features/bookmarks/domain/repositories/bookmarks.dart';
 
 part 'bookmarks.g.dart';
 
-/// Check if a root folder is effectively empty (has no non-root children)
+/// Whether a root folder holds anything worth showing.
-bool _isEmptyRootFolder(BookmarkFolder folder) {
+///
-  if (folder.children == null) return true;
+/// Roots always contain each other, so a root that only contains other roots
-  // A root folder is empty if it has no children, or only contains other root folders
+/// counts as empty.
-  return folder.children!.every(
+bool _hasVisibleContent(BookmarkFolder? folder) {
-    (child) => bookmarkRootIds.contains(child.guid),
+  final children = folder?.children;
-  );
+  if (children == null) return false;
-}
+  return children.any((child) => !bookmarkRootIds.contains(child.guid));
-
-T? _selectChildRecursive<T extends BookmarkItem>(
-  List<BookmarkItem> children,
-  String guid,
-) {
-  for (final child in children) {
-    if (child.guid == guid && child is T) {
-      return child;
-    }
-
-    if (child case final BookmarkFolder folder) {
-      if (folder.children != null) {
-        final result = _selectChildRecursive<T>(folder.children!, guid);
-        if (result != null) {
-          return result;
-        }
-      }
-    }
-  }
-
-  return null;
-}
-
-T _cloneAndFilterChildrenType<T extends BookmarkItem>(T node) {
-  if (node is BookmarkFolder) {
-    if (node.children != null) {
-      return node.copyWith.children(
-            node.children
-                ?.whereType<T>()
-                .map((e) => _cloneAndFilterChildrenType<T>(e))
-                .toList(),
-          )
-          as T;
-    }
-  }
-
-  return node.clone() as T;
-}
-
-BookmarkItem? _cloneAndFilterOnGuids(BookmarkItem node, Set<String> guids) {
-  if (node is BookmarkFolder) {
-    if (node.children != null) {
-      final filtered = node.children
-          ?.where((e) => e is BookmarkFolder || guids.contains(e.guid))
-          .map((e) => _cloneAndFilterOnGuids(e, guids))
-          .nonNulls
-          .toList();
-
-      if (filtered.isNotEmpty) {
-        return node.copyWith.children(filtered);
-      } else {
-        return null;
-      }
-    }
-  }
-
-  if (guids.contains(node.guid)) {
-    return node.clone();
-  }
-
-  return null;
-}
-
-@Riverpod()
-class BookmarksSearch extends _$BookmarksSearch {
-  final _service = GeckoBookmarksService();
-  late StreamController<Set<String>> _streamController;
-
-  Future<void> search(String query, {int limit = 10}) async {
-    if (query.isNotEmpty) {
-      try {
-        await _service.searchBookmarks(query, limit: limit).then((value) {
-          if (!_streamController.isClosed) {
-            _streamController.add(value.map((e) => e.guid).toSet());
-          }
-        });
-      } on PlatformException catch (e) {
-        if (e.code == 'OperationInterrupted') return;
-        rethrow;
-      }
-    }
-  }
-
-  @override
-  Stream<Set<String>> build() {
-    _streamController = StreamController();
-
-    ref.onDispose(() async {
-      await _streamController.close();
-    });
-
-    return _streamController.stream;
-  }
 }
 
 @Riverpod()
 class BookmarkSearchResults extends _$BookmarkSearchResults {
   final _service = GeckoBookmarksService();
 
+  /// Identifies the most recent request.
+  ///
+  /// Typing starts a search per keystroke and storage does not answer them in
+  /// order, so a slow early query could otherwise land after a fast later one
+  /// and leave the list showing results for text the user has moved on from.
+  int _latestRequest = 0;
+
   Future<void> search(String query, {int limit = 10}) async {
+    final request = ++_latestRequest;
+
     if (query.isEmpty) {
       state = [];
       return;
@@ -143,7 +56,7 @@ class BookmarkSearchResults extends _$BookmarkSearchResults {
 
     try {
       final results = await _service.searchBookmarks(query, limit: limit);
-      if (!ref.mounted) return;
+      if (!ref.mounted || request != _latestRequest) return;
       state = results
           .map(BookmarkItem.parseRecursive)
           .whereType<BookmarkEntry>()
@@ -160,98 +73,75 @@ class BookmarkSearchResults extends _$BookmarkSearchResults {
   }
 }
 
+/// A single folder with its direct children.
+///
+/// The load is scoped to one folder, so its cost tracks the folder being shown
+/// rather than the size of the library. Rebuilds whenever the repository
+/// reports a change.
 @Riverpod()
-AsyncValue<T?> bookmarks<T extends BookmarkItem>(
+Future<BookmarkFolder?> bookmarkFolder(Ref ref, String guid) {
+  ref.watch(bookmarksRepositoryProvider);
+  return ref.read(bookmarksRepositoryProvider.notifier).getFolder(guid);
+}
+
+/// The folder shown by the bookmark list, with the roots the user asked to
+/// hide already removed.
+///
+/// Emptiness can only be judged by looking inside each root, but the root level
+/// has a fixed handful of children, so the extra loads are bounded and shallow.
+@Riverpod()
+Future<BookmarkFolder?> bookmarkListFolder(
   Ref ref,
   String entryGuid, {
   bool hideEmptyRoots = false,
-}) {
+}) async {
-  final bookmarksAsync = ref.watch(bookmarksRepositoryProvider);
+  final folder = await ref.watch(bookmarkFolderProvider(entryGuid).future);
 
-  return bookmarksAsync.whenData((bookmarkNode) {
+  if (folder == null ||
-    T? selectedNode;
+      !hideEmptyRoots ||
+      entryGuid != BookmarkRoot.root.id ||
+      folder.children == null) {
+    return folder;
+  }
 
-    if (bookmarkNode != null && bookmarkNode is T) {
+  final visible = <BookmarkItem>[];
-      if (bookmarkNode.guid == entryGuid) {
+  for (final child in folder.children!) {
-        selectedNode = bookmarkNode;
+    if (child is! BookmarkFolder || child.guid == BookmarkRoot.mobile.id) {
-      } else if (bookmarkNode case final BookmarkFolder folder) {
+      visible.add(child);
-        if (folder.children != null) {
+      continue;
-          selectedNode = _selectChildRecursive<T>(folder.children!, entryGuid);
-        }
-      }
     }
 
-    if (selectedNode != null) {
+    final loaded = await ref.watch(bookmarkFolderProvider(child.guid).future);
-      var result = _cloneAndFilterChildrenType<T>(selectedNode);
+    if (_hasVisibleContent(loaded)) {
-
+      visible.add(child);
-      // Filter empty root folders when viewing root level (excluding WebLibre root)
-      if (hideEmptyRoots &&
-          entryGuid == BookmarkRoot.root.id &&
-          result is BookmarkFolder) {
-        final filteredChildren = result.children
-            ?.where(
-              (child) =>
-                  child is! BookmarkFolder ||
-                  child.guid == BookmarkRoot.mobile.id ||
-                  !_isEmptyRootFolder(child),
-            )
-            .toList();
-        result = result.copyWith.children(filteredChildren) as T;
-      }
-
-      return result;
     }
+  }
 
-    return null;
+  return folder.copyWith.children(visible);
-  });
 }
 
+/// Guids of the bookmarks pointing at [url], or an empty list when there are
+/// none.
+///
+/// Backed by a storage lookup, so "is this page bookmarked?" costs the same
+/// whether the user has ten bookmarks or fifty thousand.
 @Riverpod()
-class SeamlessBookmarks extends _$SeamlessBookmarks {
+Future<List<String>> bookmarkGuidsForUrl(Ref ref, Uri? url) async {
-  bool _hasSearch = false;
+  if (url == null) return const [];
 
-  void search(String input) {
+  ref.watch(bookmarksRepositoryProvider);
-    if (input.isNotEmpty) {
+  return ref
-      if (!_hasSearch) {
+      .read(bookmarksRepositoryProvider.notifier)
-        _hasSearch = true;
+      .bookmarkGuidsForUrl(url);
-        ref.invalidateSelf();
+}
-      }
+
-
+/// Number of bookmarks inside the trees rooted at [guids].
-      //Don't block
+///
-      unawaited(ref.read(bookmarksSearchProvider.notifier).search(input));
+/// Used to tell the user how much a destructive action will affect.
-    } else if (_hasSearch) {
+@Riverpod()
-      _hasSearch = false;
+Future<int> bookmarkCountInTrees(Ref ref, List<String> guids) {
-      ref.invalidateSelf();
+  ref.watch(bookmarksRepositoryProvider);
-    }
+  return ref
-  }
+      .read(bookmarksRepositoryProvider.notifier)
-
+      .countBookmarksInTrees(guids);
-  @override
-  AsyncValue<BookmarkItem?> build(
-    String entryGuid, {
-    bool hideEmptyRoots = false,
-  }) {
-    final bookmarks = ref.watch(
-      bookmarksProvider<BookmarkItem>(
-        entryGuid,
-        hideEmptyRoots: hideEmptyRoots,
-      ),
-    );
-
-    if (_hasSearch) {
-      final filterGuids = ref.watch(bookmarksSearchProvider);
-      return bookmarks.map(
-        data: (node) =>
-            node.value.mapNotNull(
-              (node) => filterGuids.whenData(
-                (results) => _cloneAndFilterOnGuids(node, results),
-              ),
-            ) ??
-            const AsyncValue.data(null),
-        error: (e) => e,
-        loading: (s) => s,
-      );
-    } else {
-      return bookmarks;
-    }
-  }
 }

apps/weblibre/lib/features/geckoview/features/bookmarks/domain/providers/bookmarks.g.dart

@@ -9,50 +9,6 @@ part of 'bookmarks.dart';
 // GENERATED CODE - DO NOT MODIFY BY HAND
 // ignore_for_file: type=lint, type=warning
 
-@ProviderFor(BookmarksSearch)
-final bookmarksSearchProvider = BookmarksSearchProvider._();
-
-final class BookmarksSearchProvider
-    extends $StreamNotifierProvider<BookmarksSearch, Set<String>> {
-  BookmarksSearchProvider._()
-    : super(
-        from: null,
-        argument: null,
-        retry: null,
-        name: r'bookmarksSearchProvider',
-        isAutoDispose: true,
-        dependencies: null,
-        $allTransitiveDependencies: null,
-      );
-
-  @override
-  String debugGetCreateSourceHash() => _$bookmarksSearchHash();
-
-  @$internal
-  @override
-  BookmarksSearch create() => BookmarksSearch();
-}
-
-String _$bookmarksSearchHash() => r'41053cbc1014e0fdd04d9510bf15c9896a9f752d';
-
-abstract class _$BookmarksSearch extends $StreamNotifier<Set<String>> {
-  Stream<Set<String>> build();
-  @$mustCallSuper
-  @override
-  WhenComplete runBuild() {
-    final ref = this.ref as $Ref<AsyncValue<Set<String>>, Set<String>>;
-    final element =
-        ref.element
-            as $ClassProviderElement<
-              AnyNotifier<AsyncValue<Set<String>>, Set<String>>,
-              AsyncValue<Set<String>>,
-              Object?,
-              Object?
-            >;
-    return element.handleCreate(ref, build);
-  }
-}
-
 @ProviderFor(BookmarkSearchResults)
 final bookmarkSearchResultsProvider = BookmarkSearchResultsProvider._();
 
@@ -106,159 +62,70 @@ abstract class _$BookmarkSearchResults extends $Notifier<List<BookmarkEntry>> {
   }
 }
 
-@ProviderFor(bookmarks)
+/// A single folder with its direct children.
-final bookmarksProvider = BookmarksFamily._();
+///
+/// The load is scoped to one folder, so its cost tracks the folder being shown
+/// rather than the size of the library. Rebuilds whenever the repository
+/// reports a change.
 
-final class BookmarksProvider<T extends BookmarkItem>
+@ProviderFor(bookmarkFolder)
-    extends $FunctionalProvider<AsyncValue<T?>, AsyncValue<T?>, AsyncValue<T?>>
+final bookmarkFolderProvider = BookmarkFolderFamily._();
-    with $Provider<AsyncValue<T?>> {
+
-  BookmarksProvider._({
+/// A single folder with its direct children.
-    required BookmarksFamily super.from,
+///
-    required (String, {bool hideEmptyRoots}) super.argument,
+/// The load is scoped to one folder, so its cost tracks the folder being shown
+/// rather than the size of the library. Rebuilds whenever the repository
+/// reports a change.
+
+final class BookmarkFolderProvider
+    extends
+        $FunctionalProvider<
+          AsyncValue<BookmarkFolder?>,
+          BookmarkFolder?,
+          FutureOr<BookmarkFolder?>
+        >
+    with $FutureModifier<BookmarkFolder?>, $FutureProvider<BookmarkFolder?> {
+  /// A single folder with its direct children.
+  ///
+  /// The load is scoped to one folder, so its cost tracks the folder being shown
+  /// rather than the size of the library. Rebuilds whenever the repository
+  /// reports a change.
+  BookmarkFolderProvider._({
+    required BookmarkFolderFamily super.from,
+    required String super.argument,
   }) : super(
          retry: null,
-         name: r'bookmarksProvider',
+         name: r'bookmarkFolderProvider',
          isAutoDispose: true,
          dependencies: null,
          $allTransitiveDependencies: null,
        );
 
   @override
-  String debugGetCreateSourceHash() => _$bookmarksHash();
+  String debugGetCreateSourceHash() => _$bookmarkFolderHash();
 
   @override
   String toString() {
-    return r'bookmarksProvider'
+    return r'bookmarkFolderProvider'
-        '<${T}>'
-        '$argument';
-  }
-
-  @$internal
-  @override
-  $ProviderElement<AsyncValue<T?>> $createElement($ProviderPointer pointer) =>
-      $ProviderElement(pointer);
-
-  @override
-  AsyncValue<T?> create(Ref ref) {
-    final argument = this.argument as (String, {bool hideEmptyRoots});
-    return bookmarks<T>(
-      ref,
-      argument.$1,
-      hideEmptyRoots: argument.hideEmptyRoots,
-    );
-  }
-
-  $R _captureGenerics<$R>($R Function<T extends BookmarkItem>() cb) {
-    return cb<T>();
-  }
-
-  /// {@macro riverpod.override_with_value}
-  Override overrideWithValue(AsyncValue<T?> value) {
-    return $ProviderOverride(
-      origin: this,
-      providerOverride: $SyncValueProvider<AsyncValue<T?>>(value),
-    );
-  }
-
-  @override
-  bool operator ==(Object other) {
-    return other is BookmarksProvider &&
-        other.runtimeType == runtimeType &&
-        other.argument == argument;
-  }
-
-  @override
-  int get hashCode {
-    return Object.hash(runtimeType, argument);
-  }
-}
-
-String _$bookmarksHash() => r'72b54c4ff18cfdb60824a57607628be6b61d25d4';
-
-final class BookmarksFamily extends $Family {
-  BookmarksFamily._()
-    : super(
-        retry: null,
-        name: r'bookmarksProvider',
-        dependencies: null,
-        $allTransitiveDependencies: null,
-        isAutoDispose: true,
-      );
-
-  BookmarksProvider<T> call<T extends BookmarkItem>(
-    String entryGuid, {
-    bool hideEmptyRoots = false,
-  }) => BookmarksProvider<T>._(
-    argument: (entryGuid, hideEmptyRoots: hideEmptyRoots),
-    from: this,
-  );
-
-  @override
-  String toString() => r'bookmarksProvider';
-
-  /// {@macro riverpod.override_with}
-  Override overrideWith(
-    AsyncValue<T?> Function<T extends BookmarkItem>(
-      Ref ref,
-      (String, {bool hideEmptyRoots}) args,
-    )
-    create,
-  ) => $FamilyOverride(
-    from: this,
-    createElement: (pointer) {
-      final provider = pointer.origin as BookmarksProvider;
-      return provider._captureGenerics(<T extends BookmarkItem>() {
-        provider as BookmarksProvider<T>;
-        final argument = provider.argument as (String, {bool hideEmptyRoots});
-        return provider
-            .$view(create: (ref) => create(ref, argument))
-            .$createElement(pointer);
-      });
-    },
-  );
-}
-
-@ProviderFor(SeamlessBookmarks)
-final seamlessBookmarksProvider = SeamlessBookmarksFamily._();
-
-final class SeamlessBookmarksProvider
-    extends $NotifierProvider<SeamlessBookmarks, AsyncValue<BookmarkItem?>> {
-  SeamlessBookmarksProvider._({
-    required SeamlessBookmarksFamily super.from,
-    required (String, {bool hideEmptyRoots}) super.argument,
-  }) : super(
-         retry: null,
-         name: r'seamlessBookmarksProvider',
-         isAutoDispose: true,
-         dependencies: null,
-         $allTransitiveDependencies: null,
-       );
-
-  @override
-  String debugGetCreateSourceHash() => _$seamlessBookmarksHash();
-
-  @override
-  String toString() {
-    return r'seamlessBookmarksProvider'
         ''
-        '$argument';
+        '($argument)';
   }
 
   @$internal
   @override
-  SeamlessBookmarks create() => SeamlessBookmarks();
+  $FutureProviderElement<BookmarkFolder?> $createElement(
+    $ProviderPointer pointer,
+  ) => $FutureProviderElement(pointer);
 
-  /// {@macro riverpod.override_with_value}
+  @override
-  Override overrideWithValue(AsyncValue<BookmarkItem?> value) {
+  FutureOr<BookmarkFolder?> create(Ref ref) {
-    return $ProviderOverride(
+    final argument = this.argument as String;
-      origin: this,
+    return bookmarkFolder(ref, argument);
-      providerOverride: $SyncValueProvider<AsyncValue<BookmarkItem?>>(value),
-    );
   }
 
   @override
   bool operator ==(Object other) {
-    return other is SeamlessBookmarksProvider && other.argument == argument;
+    return other is BookmarkFolderProvider && other.argument == argument;
   }
 
   @override
@@ -267,64 +134,346 @@ final class SeamlessBookmarksProvider
   }
 }
 
-String _$seamlessBookmarksHash() => r'240b213fa8fe595781ccc608c5d551be54c31992';
+String _$bookmarkFolderHash() => r'a0a3754a2b8099415cffad6358d9388dc7c4e7bf';
 
-final class SeamlessBookmarksFamily extends $Family
+/// A single folder with its direct children.
-    with
+///
-        $ClassFamilyOverride<
+/// The load is scoped to one folder, so its cost tracks the folder being shown
-          SeamlessBookmarks,
+/// rather than the size of the library. Rebuilds whenever the repository
-          AsyncValue<BookmarkItem?>,
+/// reports a change.
-          AsyncValue<BookmarkItem?>,
+
-          AsyncValue<BookmarkItem?>,
+final class BookmarkFolderFamily extends $Family
-          (String, {bool hideEmptyRoots})
+    with $FunctionalFamilyOverride<FutureOr<BookmarkFolder?>, String> {
-        > {
+  BookmarkFolderFamily._()
-  SeamlessBookmarksFamily._()
     : super(
         retry: null,
-        name: r'seamlessBookmarksProvider',
+        name: r'bookmarkFolderProvider',
         dependencies: null,
         $allTransitiveDependencies: null,
         isAutoDispose: true,
       );
 
-  SeamlessBookmarksProvider call(
+  /// A single folder with its direct children.
+  ///
+  /// The load is scoped to one folder, so its cost tracks the folder being shown
+  /// rather than the size of the library. Rebuilds whenever the repository
+  /// reports a change.
+
+  BookmarkFolderProvider call(String guid) =>
+      BookmarkFolderProvider._(argument: guid, from: this);
+
+  @override
+  String toString() => r'bookmarkFolderProvider';
+}
+
+/// The folder shown by the bookmark list, with the roots the user asked to
+/// hide already removed.
+///
+/// Emptiness can only be judged by looking inside each root, but the root level
+/// has a fixed handful of children, so the extra loads are bounded and shallow.
+
+@ProviderFor(bookmarkListFolder)
+final bookmarkListFolderProvider = BookmarkListFolderFamily._();
+
+/// The folder shown by the bookmark list, with the roots the user asked to
+/// hide already removed.
+///
+/// Emptiness can only be judged by looking inside each root, but the root level
+/// has a fixed handful of children, so the extra loads are bounded and shallow.
+
+final class BookmarkListFolderProvider
+    extends
+        $FunctionalProvider<
+          AsyncValue<BookmarkFolder?>,
+          BookmarkFolder?,
+          FutureOr<BookmarkFolder?>
+        >
+    with $FutureModifier<BookmarkFolder?>, $FutureProvider<BookmarkFolder?> {
+  /// The folder shown by the bookmark list, with the roots the user asked to
+  /// hide already removed.
+  ///
+  /// Emptiness can only be judged by looking inside each root, but the root level
+  /// has a fixed handful of children, so the extra loads are bounded and shallow.
+  BookmarkListFolderProvider._({
+    required BookmarkListFolderFamily super.from,
+    required (String, {bool hideEmptyRoots}) super.argument,
+  }) : super(
+         retry: null,
+         name: r'bookmarkListFolderProvider',
+         isAutoDispose: true,
+         dependencies: null,
+         $allTransitiveDependencies: null,
+       );
+
+  @override
+  String debugGetCreateSourceHash() => _$bookmarkListFolderHash();
+
+  @override
+  String toString() {
+    return r'bookmarkListFolderProvider'
+        ''
+        '$argument';
+  }
+
+  @$internal
+  @override
+  $FutureProviderElement<BookmarkFolder?> $createElement(
+    $ProviderPointer pointer,
+  ) => $FutureProviderElement(pointer);
+
+  @override
+  FutureOr<BookmarkFolder?> create(Ref ref) {
+    final argument = this.argument as (String, {bool hideEmptyRoots});
+    return bookmarkListFolder(
+      ref,
+      argument.$1,
+      hideEmptyRoots: argument.hideEmptyRoots,
+    );
+  }
+
+  @override
+  bool operator ==(Object other) {
+    return other is BookmarkListFolderProvider && other.argument == argument;
+  }
+
+  @override
+  int get hashCode {
+    return argument.hashCode;
+  }
+}
+
+String _$bookmarkListFolderHash() =>
+    r'da6b257ef55b38021a2da7e41209b66a58cfbbb9';
+
+/// The folder shown by the bookmark list, with the roots the user asked to
+/// hide already removed.
+///
+/// Emptiness can only be judged by looking inside each root, but the root level
+/// has a fixed handful of children, so the extra loads are bounded and shallow.
+
+final class BookmarkListFolderFamily extends $Family
+    with
+        $FunctionalFamilyOverride<
+          FutureOr<BookmarkFolder?>,
+          (String, {bool hideEmptyRoots})
+        > {
+  BookmarkListFolderFamily._()
+    : super(
+        retry: null,
+        name: r'bookmarkListFolderProvider',
+        dependencies: null,
+        $allTransitiveDependencies: null,
+        isAutoDispose: true,
+      );
+
+  /// The folder shown by the bookmark list, with the roots the user asked to
+  /// hide already removed.
+  ///
+  /// Emptiness can only be judged by looking inside each root, but the root level
+  /// has a fixed handful of children, so the extra loads are bounded and shallow.
+
+  BookmarkListFolderProvider call(
     String entryGuid, {
     bool hideEmptyRoots = false,
-  }) => SeamlessBookmarksProvider._(
+  }) => BookmarkListFolderProvider._(
     argument: (entryGuid, hideEmptyRoots: hideEmptyRoots),
     from: this,
   );
 
   @override
-  String toString() => r'seamlessBookmarksProvider';
+  String toString() => r'bookmarkListFolderProvider';
 }
 
-abstract class _$SeamlessBookmarks
+/// Guids of the bookmarks pointing at [url], or an empty list when there are
-    extends $Notifier<AsyncValue<BookmarkItem?>> {
+/// none.
-  late final _$args = ref.$arg as (String, {bool hideEmptyRoots});
+///
-  String get entryGuid => _$args.$1;
+/// Backed by a storage lookup, so "is this page bookmarked?" costs the same
-  bool get hideEmptyRoots => _$args.hideEmptyRoots;
+/// whether the user has ten bookmarks or fifty thousand.
+
+@ProviderFor(bookmarkGuidsForUrl)
+final bookmarkGuidsForUrlProvider = BookmarkGuidsForUrlFamily._();
+
+/// Guids of the bookmarks pointing at [url], or an empty list when there are
+/// none.
+///
+/// Backed by a storage lookup, so "is this page bookmarked?" costs the same
+/// whether the user has ten bookmarks or fifty thousand.
+
+final class BookmarkGuidsForUrlProvider
+    extends
+        $FunctionalProvider<
+          AsyncValue<List<String>>,
+          List<String>,
+          FutureOr<List<String>>
+        >
+    with $FutureModifier<List<String>>, $FutureProvider<List<String>> {
+  /// Guids of the bookmarks pointing at [url], or an empty list when there are
+  /// none.
+  ///
+  /// Backed by a storage lookup, so "is this page bookmarked?" costs the same
+  /// whether the user has ten bookmarks or fifty thousand.
+  BookmarkGuidsForUrlProvider._({
+    required BookmarkGuidsForUrlFamily super.from,
+    required Uri? super.argument,
+  }) : super(
+         retry: null,
+         name: r'bookmarkGuidsForUrlProvider',
+         isAutoDispose: true,
+         dependencies: null,
+         $allTransitiveDependencies: null,
+       );
 
-  AsyncValue<BookmarkItem?> build(
-    String entryGuid, {
-    bool hideEmptyRoots = false,
-  });
-  @$mustCallSuper
   @override
-  WhenComplete runBuild() {
+  String debugGetCreateSourceHash() => _$bookmarkGuidsForUrlHash();
-    final ref =
+
-        this.ref as $Ref<AsyncValue<BookmarkItem?>, AsyncValue<BookmarkItem?>>;
+  @override
-    final element =
+  String toString() {
-        ref.element
+    return r'bookmarkGuidsForUrlProvider'
-            as $ClassProviderElement<
+        ''
-              AnyNotifier<AsyncValue<BookmarkItem?>, AsyncValue<BookmarkItem?>>,
+        '($argument)';
-              AsyncValue<BookmarkItem?>,
+  }
-              Object?,
+
-              Object?
+  @$internal
-            >;
+  @override
-    return element.handleCreate(
+  $FutureProviderElement<List<String>> $createElement(
-      ref,
+    $ProviderPointer pointer,
-      () => build(_$args.$1, hideEmptyRoots: _$args.hideEmptyRoots),
+  ) => $FutureProviderElement(pointer);
-    );
+
+  @override
+  FutureOr<List<String>> create(Ref ref) {
+    final argument = this.argument as Uri?;
+    return bookmarkGuidsForUrl(ref, argument);
+  }
+
+  @override
+  bool operator ==(Object other) {
+    return other is BookmarkGuidsForUrlProvider && other.argument == argument;
+  }
+
+  @override
+  int get hashCode {
+    return argument.hashCode;
   }
 }
+
+String _$bookmarkGuidsForUrlHash() =>
+    r'aeca791afdcad74c2e8af93c392860ea3cb92b20';
+
+/// Guids of the bookmarks pointing at [url], or an empty list when there are
+/// none.
+///
+/// Backed by a storage lookup, so "is this page bookmarked?" costs the same
+/// whether the user has ten bookmarks or fifty thousand.
+
+final class BookmarkGuidsForUrlFamily extends $Family
+    with $FunctionalFamilyOverride<FutureOr<List<String>>, Uri?> {
+  BookmarkGuidsForUrlFamily._()
+    : super(
+        retry: null,
+        name: r'bookmarkGuidsForUrlProvider',
+        dependencies: null,
+        $allTransitiveDependencies: null,
+        isAutoDispose: true,
+      );
+
+  /// Guids of the bookmarks pointing at [url], or an empty list when there are
+  /// none.
+  ///
+  /// Backed by a storage lookup, so "is this page bookmarked?" costs the same
+  /// whether the user has ten bookmarks or fifty thousand.
+
+  BookmarkGuidsForUrlProvider call(Uri? url) =>
+      BookmarkGuidsForUrlProvider._(argument: url, from: this);
+
+  @override
+  String toString() => r'bookmarkGuidsForUrlProvider';
+}
+
+/// Number of bookmarks inside the trees rooted at [guids].
+///
+/// Used to tell the user how much a destructive action will affect.
+
+@ProviderFor(bookmarkCountInTrees)
+final bookmarkCountInTreesProvider = BookmarkCountInTreesFamily._();
+
+/// Number of bookmarks inside the trees rooted at [guids].
+///
+/// Used to tell the user how much a destructive action will affect.
+
+final class BookmarkCountInTreesProvider
+    extends $FunctionalProvider<AsyncValue<int>, int, FutureOr<int>>
+    with $FutureModifier<int>, $FutureProvider<int> {
+  /// Number of bookmarks inside the trees rooted at [guids].
+  ///
+  /// Used to tell the user how much a destructive action will affect.
+  BookmarkCountInTreesProvider._({
+    required BookmarkCountInTreesFamily super.from,
+    required List<String> super.argument,
+  }) : super(
+         retry: null,
+         name: r'bookmarkCountInTreesProvider',
+         isAutoDispose: true,
+         dependencies: null,
+         $allTransitiveDependencies: null,
+       );
+
+  @override
+  String debugGetCreateSourceHash() => _$bookmarkCountInTreesHash();
+
+  @override
+  String toString() {
+    return r'bookmarkCountInTreesProvider'
+        ''
+        '($argument)';
+  }
+
+  @$internal
+  @override
+  $FutureProviderElement<int> $createElement($ProviderPointer pointer) =>
+      $FutureProviderElement(pointer);
+
+  @override
+  FutureOr<int> create(Ref ref) {
+    final argument = this.argument as List<String>;
+    return bookmarkCountInTrees(ref, argument);
+  }
+
+  @override
+  bool operator ==(Object other) {
+    return other is BookmarkCountInTreesProvider && other.argument == argument;
+  }
+
+  @override
+  int get hashCode {
+    return argument.hashCode;
+  }
+}
+
+String _$bookmarkCountInTreesHash() =>
+    r'efe0cc45e7e77aa542d9ebbd9f4fee5cf9ee5903';
+
+/// Number of bookmarks inside the trees rooted at [guids].
+///
+/// Used to tell the user how much a destructive action will affect.
+
+final class BookmarkCountInTreesFamily extends $Family
+    with $FunctionalFamilyOverride<FutureOr<int>, List<String>> {
+  BookmarkCountInTreesFamily._()
+    : super(
+        retry: null,
+        name: r'bookmarkCountInTreesProvider',
+        dependencies: null,
+        $allTransitiveDependencies: null,
+        isAutoDispose: true,
+      );
+
+  /// Number of bookmarks inside the trees rooted at [guids].
+  ///
+  /// Used to tell the user how much a destructive action will affect.
+
+  BookmarkCountInTreesProvider call(List<String> guids) =>
+      BookmarkCountInTreesProvider._(argument: guids, from: this);
+
+  @override
+  String toString() => r'bookmarkCountInTreesProvider';
+}

apps/weblibre/lib/features/geckoview/features/bookmarks/domain/repositories/bookmarks.dart

@@ -18,11 +18,12 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 import 'package:flutter_mozilla_components/flutter_mozilla_components.dart';
-import 'package:nullability/nullability.dart';
 import 'package:riverpod_annotation/riverpod_annotation.dart';
 import 'package:weblibre/core/logger.dart';
 import 'package:weblibre/features/geckoview/features/bookmarks/domain/entities/bookmark_item.dart';
 import 'package:weblibre/features/geckoview/features/bookmarks/utils/bookmark_html_utils.dart';
+import 'package:weblibre/features/geckoview/features/bookmarks/utils/bookmark_import_isolate.dart';
+import 'package:weblibre/features/geckoview/features/bookmarks/utils/bookmark_importer.dart';
 import 'package:weblibre/features/geckoview/features/bookmarks/utils/bookmark_json_utils.dart';
 
 part 'bookmarks.g.dart';
@@ -40,7 +41,7 @@ class BookmarksRepository extends _$BookmarksRepository {
     int? position,
   }) async {
     await _service.addItem(parentGuid, url, title, position);
-    ref.invalidateSelf();
+    _notifyChanged();
   }
 
   Future<void> addFolder({
@@ -49,7 +50,7 @@ class BookmarksRepository extends _$BookmarksRepository {
     int? position,
   }) async {
     await _service.addFolder(parentGuid, title, position);
-    ref.invalidateSelf();
+    _notifyChanged();
   }
 
   Future<void> editBookmark({
@@ -68,7 +69,7 @@ class BookmarksRepository extends _$BookmarksRepository {
         position: position,
       ),
     );
-    ref.invalidateSelf();
+    _notifyChanged();
   }
 
   Future<void> editFolder({
@@ -81,12 +82,12 @@ class BookmarksRepository extends _$BookmarksRepository {
       guid,
       BookmarkInfo(title: title, parentGuid: parentGuid, position: position),
     );
-    ref.invalidateSelf();
+    _notifyChanged();
   }
 
   Future<void> delete(String guid) async {
     await _service.deleteNode(guid);
-    ref.invalidateSelf();
+    _notifyChanged();
   }
 
   Future<void> moveMany({
@@ -104,7 +105,7 @@ class BookmarksRepository extends _$BookmarksRepository {
         BookmarkInfo(parentGuid: targetParentGuid),
       );
     }
-    ref.invalidateSelf();
+    _notifyChanged();
   }
 
   Future<void> deleteMany(Iterable<String> guids) async {
@@ -115,7 +116,7 @@ class BookmarksRepository extends _$BookmarksRepository {
       }
       await _service.deleteNode(guid);
     }
-    ref.invalidateSelf();
+    _notifyChanged();
   }
 
   Future<void> flattenFolder({required BookmarkFolder folder}) async {
@@ -137,7 +138,45 @@ class BookmarksRepository extends _$BookmarksRepository {
       }
     }
     await _service.deleteNode(folder.guid);
-    ref.invalidateSelf();
+    _notifyChanged();
+  }
+
+  /// Loads a single folder and its direct children.
+  ///
+  /// This is the load the bookmark UI is built on: the cost is proportional to
+  /// the folder being shown, not to the size of the library. Reach for
+  /// [getFolderTree] only when an operation genuinely needs descendants.
+  Future<BookmarkFolder?> getFolder(String guid) async {
+    final node = await _service.getTree(guid);
+    if (node == null || node.type != BookmarkNodeType.folder) return null;
+    return BookmarkItem.parseRecursive(node) as BookmarkFolder?;
+  }
+
+  /// Loads a folder with every descendant.
+  ///
+  /// Only for operations that need the whole subtree — export, flatten, "open
+  /// all in folder". Never for rendering a list.
+  Future<BookmarkFolder?> getFolderTree(String guid) async {
+    final node = await _service.getTree(guid, recursive: true);
+    if (node == null || node.type != BookmarkNodeType.folder) return null;
+    return BookmarkItem.parseRecursive(node) as BookmarkFolder?;
+  }
+
+  /// Number of bookmark items inside the trees rooted at [guids].
+  ///
+  /// Counted in storage, so this stays cheap on a large library.
+  Future<int> countBookmarksInTrees(Iterable<String> guids) {
+    if (guids.isEmpty) return Future.value(0);
+    return _service.countBookmarksInTrees(guids.toList());
+  }
+
+  /// Guids of every bookmark entry pointing at [url].
+  ///
+  /// Answers "is this page bookmarked?" through a storage lookup instead of
+  /// scanning an in-memory tree.
+  Future<List<String>> bookmarkGuidsForUrl(Uri url) async {
+    final nodes = await _service.getBookmarksWithUrl(url);
+    return nodes.map((node) => node.guid).toList();
   }
 
   /// Returns the GUIDs of all descendant folders of [guid] by fetching the
@@ -163,18 +202,44 @@ class BookmarksRepository extends _$BookmarksRepository {
 
   Future<void> eraseEverything(BookmarkRoot root) async {
     await _service.eraseEverything(root);
-    ref.invalidateSelf();
+    _notifyChanged();
   }
 
   Future<int> importFromJSON(String jsonString, {bool replace = false}) async {
     final count = await _jsonUtils.importFromJSON(jsonString, replace: replace);
-    ref.invalidateSelf();
+    _notifyChanged();
     return count;
   }
 
   Future<int> importFromHTML(String htmlString, {bool replace = false}) async {
     final count = await _htmlUtils.importFromHTML(htmlString, replace: replace);
-    ref.invalidateSelf();
+    _notifyChanged();
+    return count;
+  }
+
+  /// Imports the bookmark file at [path], parsing it in a background isolate.
+  ///
+  /// Preferred over [importFromHTML]/[importFromJSON] for user-initiated
+  /// imports: neither the raw file nor the intermediate parse tree ever touches
+  /// the UI isolate.
+  Future<int> importFromFile({
+    required String path,
+    required BookmarkImportFormat format,
+    bool replace = false,
+  }) async {
+    final tree = await parseBookmarkFile(
+      path: path,
+      format: format,
+      // Replacing the library is the only case where a file's own root folders
+      // should take over the corresponding Places roots.
+      preserveRootFolders: replace,
+    );
+
+    final count = await BookmarkTreeImporter(
+      _service,
+    ).import(tree, replace: replace);
+
+    _notifyChanged();
     return count;
   }
 
@@ -188,9 +253,16 @@ class BookmarksRepository extends _$BookmarksRepository {
     return await _htmlUtils.exportToHTML(root: root);
   }
 
+  /// A revision that advances whenever bookmarks change.
+  ///
+  /// The repository deliberately holds no bookmark data. It used to build the
+  /// entire tree recursively from [BookmarkRoot.root], which meant every
+  /// consumer paid for the whole library — the reason opening bookmarks after
+  /// a large import or sync could bring the app down. Data now comes from the
+  /// folder-scoped providers, which watch this value to know when to reload.
   @override
-  Future<BookmarkItem?> build() async {
+  int build() => 0;
-    final node = await _service.getTree(BookmarkRoot.root.id, recursive: true);
+
-    return node.mapNotNull(BookmarkItem.parseRecursive);
+  /// Signals that stored bookmarks changed, prompting dependents to reload.
-  }
+  void _notifyChanged() => state++;
 }

apps/weblibre/lib/features/geckoview/features/bookmarks/domain/repositories/bookmarks.g.dart

@@ -13,7 +13,7 @@ part of 'bookmarks.dart';
 final bookmarksRepositoryProvider = BookmarksRepositoryProvider._();
 
 final class BookmarksRepositoryProvider
-    extends $AsyncNotifierProvider<BookmarksRepository, BookmarkItem?> {
+    extends $NotifierProvider<BookmarksRepository, int> {
   BookmarksRepositoryProvider._()
     : super(
         from: null,
@@ -31,22 +31,30 @@ final class BookmarksRepositoryProvider
   @$internal
   @override
   BookmarksRepository create() => BookmarksRepository();
+
+  /// {@macro riverpod.override_with_value}
+  Override overrideWithValue(int value) {
+    return $ProviderOverride(
+      origin: this,
+      providerOverride: $SyncValueProvider<int>(value),
+    );
+  }
 }
 
 String _$bookmarksRepositoryHash() =>
-    r'2169d5b354c4a22192096451c96ab1490cf55ab4';
+    r'bf95d30f21773e931b12fd85d03d072d88d5b715';
 
-abstract class _$BookmarksRepository extends $AsyncNotifier<BookmarkItem?> {
+abstract class _$BookmarksRepository extends $Notifier<int> {
-  FutureOr<BookmarkItem?> build();
+  int build();
   @$mustCallSuper
   @override
   WhenComplete runBuild() {
-    final ref = this.ref as $Ref<AsyncValue<BookmarkItem?>, BookmarkItem?>;
+    final ref = this.ref as $Ref<int, int>;
     final element =
         ref.element
             as $ClassProviderElement<
-              AnyNotifier<AsyncValue<BookmarkItem?>, BookmarkItem?>,
+              AnyNotifier<int, int>,
-              AsyncValue<BookmarkItem?>,
+              int,
               Object?,
               Object?
             >;

apps/weblibre/lib/features/geckoview/features/bookmarks/domain/utils/bookmark_tree_utils.dart

@@ -21,142 +21,101 @@ import 'package:flutter_mozilla_components/flutter_mozilla_components.dart';
 import 'package:weblibre/features/geckoview/features/bookmarks/domain/entities/bookmark_item.dart';
 import 'package:weblibre/features/geckoview/features/bookmarks/domain/entities/bookmark_sort_type.dart';
 
-/// Recursively sorts a bookmark tree by the given sort type.
+/// Sorts one folder's direct children by the given sort type.
-/// Root-level built-in folders are kept in their canonical order.
+///
-BookmarkItem sortBookmarkTree(
+/// Only the level being displayed is sorted; descendants are not loaded, so
-  BookmarkItem item,
+/// there is nothing deeper to order. Root-level built-in folders are kept
+/// pinned in their canonical order ahead of everything else.
+List<BookmarkItem> sortBookmarkChildren(
+  List<BookmarkItem> children,
   BookmarkSortType sortType, {
   bool isRoot = false,
 }) {
-  if (sortType == BookmarkSortType.manual) return item;
+  if (sortType == BookmarkSortType.manual) return children;
 
-  if (item is BookmarkFolder && item.children != null) {
+  if (!isRoot) {
-    final sortedChildren = item.children!.map((child) {
+    return [...children]..sort((a, b) => compareBookmarkItems(a, b, sortType));
-      return sortBookmarkTree(child, sortType);
-    }).toList();
-
-    // At root level, keep built-in root folders pinned in original order
-    if (isRoot) {
-      final rootFolders = <BookmarkItem>[];
-      final nonRootItems = <BookmarkItem>[];
-      for (final child in sortedChildren) {
-        if (bookmarkRootIds.contains(child.guid)) {
-          rootFolders.add(child);
-        } else {
-          nonRootItems.add(child);
-        }
-      }
-      nonRootItems.sort((a, b) => compareBookmarkItems(a, b, sortType));
-      return BookmarkFolder(
-        guid: item.guid,
-        parentGuid: item.parentGuid,
-        title: item.title,
-        position: item.position,
-        dateAdded: item.dateAdded,
-        children: [...rootFolders, ...nonRootItems],
-      );
-    }
-
-    sortedChildren.sort((a, b) => compareBookmarkItems(a, b, sortType));
-    return BookmarkFolder(
-      guid: item.guid,
-      parentGuid: item.parentGuid,
-      title: item.title,
-      position: item.position,
-      dateAdded: item.dateAdded,
-      children: sortedChildren,
-    );
   }
 
-  return item;
+  final rootFolders = <BookmarkItem>[];
-}
+  final rest = <BookmarkItem>[];
-
+  for (final child in children) {
-/// Collects all descendant folder GUIDs from a folder (not including the folder itself).
+    if (bookmarkRootIds.contains(child.guid)) {
-Set<String> collectDescendantFolderGuids(BookmarkFolder folder) {
+      rootFolders.add(child);
-  final result = <String>{};
+    } else {
-  if (folder.children != null) {
+      rest.add(child);
-    for (final child in folder.children!) {
-      if (child is BookmarkFolder) {
-        result.add(child.guid);
-        result.addAll(collectDescendantFolderGuids(child));
-      }
     }
   }
-  return result;
+  rest.sort((a, b) => compareBookmarkItems(a, b, sortType));
+
+  return [...rootFolders, ...rest];
 }
 
-/// Resolves BookmarkItems from a tree by their GUIDs.
+/// One rendered line of the bookmark list: an item and how deep it sits.
-List<BookmarkItem> resolveSelectedItems(BookmarkItem root, Set<String> guids) {
+///
-  final result = <BookmarkItem>[];
+/// The list flattens the expanded folders into rows rather than nesting
-  _collectByGuids(root, guids, result);
+/// widgets, so it can stay a `ListView.builder` and only build what is on
-  return result;
+/// screen — a folder with thousands of entries costs the same to expand as a
+/// small one.
+class BookmarkRow {
+  final BookmarkItem item;
+  final int depth;
+
+  /// True when this row only stands in for [item]'s children while they load.
+  ///
+  /// A placeholder repeats the folder it belongs to, so it must never be
+  /// treated as a second occurrence of that folder — acting on it would apply
+  /// the same operation twice.
+  final bool isPlaceholder;
+
+  const BookmarkRow(this.item, this.depth, {this.isPlaceholder = false});
 }
 
-void _collectByGuids(
+/// Resolves the items of [children] whose GUIDs are in [guids].
-  BookmarkItem item,
+///
+/// The caller passes whatever is currently displayed, which may be one folder's
+/// children, several expanded levels, or search hits from all over the library.
+List<BookmarkItem> resolveSelectedItems(
+  List<BookmarkItem> children,
   Set<String> guids,
-  List<BookmarkItem> result,
 ) {
-  if (guids.contains(item.guid)) {
+  return children.where((child) => guids.contains(child.guid)).toList();
-    result.add(item);
-  }
-  if (item is BookmarkFolder && item.children != null) {
-    for (final child in item.children!) {
-      _collectByGuids(child, guids, result);
-    }
-  }
 }
 
-/// Whether a folder can be flattened (non-root, has a parent, has children).
+/// Drops selections that sit inside another selected folder.
-bool canFlattenFolder(BookmarkFolder folder) {
+///
-  return folder.parentGuid != null &&
+/// Expanding a folder makes its children selectable alongside it, and acting on
-      !bookmarkRootIds.contains(folder.guid) &&
+/// both would move a child out of the very folder that just moved, or delete it
-      folder.children != null &&
+/// twice. A folder's descendants are exactly the rows that follow it until the
-      folder.children!.isNotEmpty;
+/// depth returns to its own, so one pass over [rows] is enough.
-}
+Set<String> normalizeSelection(List<BookmarkRow> rows, Set<String> selected) {
+  final result = <String>{};
+  var skipBelowDepth = -1;
 
-/// Normalizes a selection set: removes items that are descendants of selected folders.
+  for (final row in rows) {
-/// This prevents double-applying moves when both a folder and its children are selected.
+    if (skipBelowDepth >= 0) {
-Set<String> normalizeSelection(BookmarkItem root, Set<String> selectedGuids) {
+      if (row.depth > skipBelowDepth) continue;
-  final items = resolveSelectedItems(root, selectedGuids);
+      skipBelowDepth = -1;
-  final folderGuidsToRemove = <String>{};
-
-  for (final item in items) {
-    if (item is BookmarkFolder) {
-      _collectAllDescendantGuids(item, folderGuidsToRemove);
     }
-  }
 
-  return selectedGuids.difference(folderGuidsToRemove);
+    if (row.isPlaceholder) continue;
-}
 
-void _collectAllDescendantGuids(BookmarkFolder folder, Set<String> result) {
+    if (selected.contains(row.item.guid)) {
-  if (folder.children != null) {
+      result.add(row.item.guid);
-    for (final child in folder.children!) {
+      if (row.item is BookmarkFolder) {
-      result.add(child.guid);
+        skipBelowDepth = row.depth;
-      if (child is BookmarkFolder) {
-        _collectAllDescendantGuids(child, result);
-      }
-    }
-  }
-}
-
-/// Returns GUIDs of all bookmark entries matching [url] in the tree.
-List<String> bookmarkGuidsForUrl(BookmarkItem? root, Uri? url) {
-  final result = <String>[];
-  if (root == null || url == null) return result;
-
-  void collect(BookmarkItem item) {
-    if (item is BookmarkEntry && item.url == url) {
-      result.add(item.guid);
-    }
-    if (item is BookmarkFolder) {
-      for (final child in item.children ?? const <BookmarkItem>[]) {
-        collect(child);
       }
     }
   }
 
-  collect(root);
   return result;
 }
+
+/// Whether a folder can be flattened (non-root and has a parent).
+///
+/// Whether it actually holds anything is left to the repository, which reads
+/// the folder's children at the moment of the operation rather than relying on
+/// what the list happens to have loaded.
+bool canFlattenFolder(BookmarkFolder folder) {
+  return folder.parentGuid != null && !bookmarkRootIds.contains(folder.guid);
+}

apps/weblibre/lib/features/geckoview/features/bookmarks/presentation/dialogs/delete_folder_dialog.dart

@@ -19,16 +19,33 @@
  */
 import 'package:flutter/material.dart';
 
-Future<bool?> showDeleteFolderDialog(BuildContext context) {
+/// Confirms deleting a folder and everything inside it.
+///
+/// Pass [bookmarkCount] to name how many bookmarks go with it. The list only
+/// shows one level at a time, so the contents of a folder are usually off
+/// screen when this is asked.
+Future<bool?> showDeleteFolderDialog(
+  BuildContext context, {
+  int? bookmarkCount,
+}) {
   return showDialog<bool?>(
     context: context,
     builder: (BuildContext context) {
       return AlertDialog(
         icon: const Icon(Icons.warning),
         title: const Text('Delete Folder'),
-        content: const Text(
+        content: Text(switch (bookmarkCount) {
-          'Are you sure you want to delete this Folder including all bookmarks?',
+          null =>
-        ),
+            'Are you sure you want to delete this Folder including '
+                'all bookmarks?',
+          0 => 'Are you sure you want to delete this Folder?',
+          1 =>
+            'Are you sure you want to delete this Folder and the '
+                '1 bookmark inside it?',
+          final count =>
+            'Are you sure you want to delete this Folder and the '
+                '$count bookmarks inside it?',
+        }),
         actions: <Widget>[
           TextButton(
             onPressed: () {

apps/weblibre/lib/features/geckoview/features/bookmarks/presentation/screens/bookmark_list.dart

@@ -17,10 +17,9 @@
  * You should have received a copy of the GNU Affero General Public License
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
+import 'dart:async';
 import 'dart:convert';
-import 'dart:io';
 
-import 'package:animated_tree_view/animated_tree_view.dart';
 import 'package:convert/convert.dart';
 import 'package:file_picker/file_picker.dart';
 import 'package:flutter/material.dart';
@@ -44,6 +43,7 @@ import 'package:weblibre/features/geckoview/features/bookmarks/presentation/dial
 import 'package:weblibre/features/geckoview/features/bookmarks/presentation/dialogs/delete_folder_dialog.dart';
 import 'package:weblibre/features/geckoview/features/bookmarks/presentation/dialogs/import_bookmarks_dialog.dart';
 import 'package:weblibre/features/geckoview/features/bookmarks/presentation/dialogs/select_bookmark_folder_dialog.dart';
+import 'package:weblibre/features/geckoview/features/bookmarks/utils/bookmark_import_isolate.dart';
 import 'package:weblibre/features/geckoview/features/tabs/data/entities/tab_mode.dart';
 import 'package:weblibre/features/user/domain/repositories/general_settings.dart';
 import 'package:weblibre/presentation/hooks/menu_controller.dart';
@@ -52,6 +52,15 @@ import 'package:weblibre/presentation/widgets/uri_breadcrumb.dart';
 import 'package:weblibre/presentation/widgets/url_icon.dart';
 import 'package:weblibre/utils/ui_helper.dart';
 
+/// How many hits an in-list search asks storage for.
+///
+/// Generous enough to be useful on a large library while staying a bounded,
+/// lazily rendered list.
+const _searchResultLimit = 200;
+
+/// Indentation applied per level of folder nesting.
+const _indentPerDepth = 20.0;
+
 class BookmarkListScreen extends HookConsumerWidget {
   final String entryGuid;
 
@@ -59,18 +68,15 @@ class BookmarkListScreen extends HookConsumerWidget {
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
-    final treeController =
-        useState<TreeViewController<BookmarkItem, TreeNode<BookmarkItem>>?>(
-          null,
-        );
-    // Tracks which folder GUIDs are expanded, so expansion state survives
-    // tree rebuilds caused by sort type changes.
-    final expandedGuids = useRef(<String>{});
     final hideEmptyRoots = useState(true);
     final uiState = ref.watch(bookmarkListUiStateProvider);
     final uiStateNotifier = ref.read(bookmarkListUiStateProvider.notifier);
-    final bookmarkList = ref.watch(
+
-      seamlessBookmarksProvider(
+    // Only the folder being shown is loaded. Descendants stay in storage until
+    // the user navigates into them, which is what keeps this screen openable on
+    // a large library.
+    final folderAsync = ref.watch(
+      bookmarkListFolderProvider(
         entryGuid,
         hideEmptyRoots: hideEmptyRoots.value,
       ),
@@ -78,25 +84,46 @@ class BookmarkListScreen extends HookConsumerWidget {
 
     final textFilterEnabled = useState(false);
     final textFilterController = useTextEditingController();
+    final searchQuery = useState('');
 
     useOnListenableChange(textFilterController, () {
-      if (ref.exists(
+      searchQuery.value = textFilterController.text;
-        seamlessBookmarksProvider(
+      // Searching goes through storage rather than filtering a loaded tree, so
-          entryGuid,
+      // it reaches bookmarks this screen never loaded.
-          hideEmptyRoots: hideEmptyRoots.value,
+      unawaited(
-        ),
-      )) {
         ref
-            .read(
+            .read(bookmarkSearchResultsProvider.notifier)
-              seamlessBookmarksProvider(
+            .search(textFilterController.text, limit: _searchResultLimit),
-                entryGuid,
+      );
-                hideEmptyRoots: hideEmptyRoots.value,
-              ).notifier,
-            )
-            .search(textFilterController.text);
-      }
     });
 
+    final isSearching = searchQuery.value.isNotEmpty;
+    final searchResults = ref.watch(bookmarkSearchResultsProvider);
+
+    // Folders the user has opened. Keyed by guid so expansion survives sort and
+    // filter changes.
+    final expandedGuids = useState(<String>{});
+
+    // Storage can only match bookmarks, never folders, so "Folders Only" and a
+    // search query have no overlap to show.
+    final searchSuppressedByFilter = isSearching && uiState.foldersOnly;
+
+    // Everything currently on screen, flattened. Selection is resolved against
+    // exactly these rows — search hits come from anywhere in the library, and
+    // expanded folders contribute items from below the entry folder.
+    final rows = isSearching
+        ? [
+            if (!searchSuppressedByFilter)
+              for (final result in searchResults) BookmarkRow(result, 0),
+          ]
+        : _buildRows(
+            ref,
+            folderAsync.value,
+            uiState,
+            expandedGuids.value,
+            depth: 0,
+          );
+
     return PopScope(
       canPop: !uiState.selectionMode,
       onPopInvokedWithResult: (didPop, _) {
@@ -106,13 +133,18 @@ class BookmarkListScreen extends HookConsumerWidget {
       },
       child: Scaffold(
         appBar: uiState.selectionMode
-            ? _buildSelectionAppBar(context, ref, uiState, uiStateNotifier)
+            ? _buildSelectionAppBar(
+                context,
+                ref,
+                uiState,
+                uiStateNotifier,
+                rows,
+              )
             : _buildNormalAppBar(
                 context,
                 ref,
-                treeController,
-                expandedGuids,
                 hideEmptyRoots,
+                expandedGuids,
                 textFilterEnabled,
                 textFilterController,
                 uiStateNotifier,
@@ -121,117 +153,173 @@ class BookmarkListScreen extends HookConsumerWidget {
         body: SafeArea(
           child: Padding(
             padding: const EdgeInsets.only(left: 12.0),
-            child: bookmarkList.when(
+            child: isSearching
-              skipLoadingOnReload: true,
+                ? _buildRowList(
-              data: (list) {
+                    context,
-                final sortedList = list != null
+                    ref,
-                    ? sortBookmarkTree(
+                    rows,
-                        list,
+                    uiState,
-                        uiState.sortType,
+                    uiStateNotifier,
-                        isRoot: entryGuid == BookmarkRoot.root.id,
+                    expandedGuids,
-                      )
+                    emptyLabel: searchSuppressedByFilter
-                    : null;
+                        ? 'Search matches bookmarks, which "Folders Only" is '
-
+                              'hiding'
-                TreeNode<BookmarkItem> addChildren(
+                        : 'No bookmarks match "${searchQuery.value}"',
-                  TreeNode<BookmarkItem>? parent,
+                  )
-                  BookmarkItem item,
+                : folderAsync.when(
-                ) {
+                    skipLoadingOnReload: true,
-                  if (uiState.foldersOnly && item is BookmarkEntry) {
+                    data: (_) => _buildRowList(
-                    return parent ?? TreeNode<BookmarkItem>.root();
+                      context,
-                  }
+                      ref,
-
+                      rows,
-                  final node = TreeNode(
+                      uiState,
-                    key: item.guid,
+                      uiStateNotifier,
-                    data: item,
+                      expandedGuids,
-                    parent: parent,
+                      emptyLabel: 'Empty',
-                  );
+                    ),
-                  final targetNode = (parent?..add(node)) ?? node;
+                    error: (error, stackTrace) => Center(
-
+                      child: FailureWidget(
-                  if (item is BookmarkFolder && item.children != null) {
+                        title: 'Failed to load Bookmarks',
-                    for (final child in item.children!) {
+                        exception: error,
-                      addChildren(node, child);
+                        onRetry: () {
-                    }
+                          ref.invalidate(bookmarkFolderProvider(entryGuid));
-                  }
+                        },
-
-                  return targetNode;
-                }
-
-                final root = (sortedList != null)
-                    ? addChildren(null, sortedList)
-                    : TreeNode<BookmarkItem>.root();
-
-                return TreeView.simple(
-                  key: ValueKey((uiState.sortType, uiState.foldersOnly)),
-                  tree: root,
-                  showRootNode: entryGuid != BookmarkRoot.root.id,
-                  onTreeReady: (controller) {
-                    treeController.value = controller;
-                    if (expandedGuids.value.isNotEmpty) {
-                      _restoreExpansion(controller, root, expandedGuids.value);
-                    } else {
-                      controller.expandAllChildren(root, recursive: true);
-                    }
-                  },
-                  expansionIndicatorBuilder: (context, tree) =>
-                      ChevronIndicator.upDown(
-                        tree: tree,
-                        padding: const EdgeInsets.symmetric(
-                          vertical: 16.0,
-                          horizontal: 12.0,
-                        ),
                       ),
-                  builder: (context, item) {
+                    ),
-                    final BookmarkItem? data = item.data;
+                    loading: () =>
-                    final isSelected = uiState.selectedGuids.contains(
+                        const Center(child: CircularProgressIndicator()),
-                      data?.guid,
+                  ),
-                    );
-                    final bool isLeaf = item.isLeaf;
-                    final bool isExpanded = item.isExpanded;
-
-                    return switch (data) {
-                      final BookmarkEntry bookmark => _buildEntryTile(
-                        context,
-                        ref,
-                        bookmark,
-                        uiState,
-                        uiStateNotifier,
-                        isSelected,
-                        sortedList,
-                      ),
-                      final BookmarkFolder folder => _buildFolderTile(
-                        context,
-                        ref,
-                        folder,
-                        isLeaf: isLeaf,
-                        isExpanded: isExpanded,
-                        uiState: uiState,
-                        uiStateNotifier: uiStateNotifier,
-                        isSelected: isSelected,
-                        rootItem: sortedList,
-                      ),
-                      null => const Center(child: Text('Empty')),
-                    };
-                  },
-                );
-              },
-              error: (error, stackTrace) => Center(
-                child: FailureWidget(
-                  title: 'Failed to load Bookmarks',
-                  exception: error,
-                  onRetry: () {
-                    // ignore: unused_result
-                    ref.refresh(bookmarksProvider<BookmarkItem>(entryGuid));
-                  },
-                ),
-              ),
-              loading: () => const Center(child: CircularProgressIndicator()),
-            ),
           ),
         ),
       ),
     );
   }
 
+  /// Flattens the entry folder and every expanded folder beneath it into rows.
+  ///
+  /// A folder's children are only requested once it is expanded, so a collapsed
+  /// subtree costs nothing — this is what keeps the screen openable after a
+  /// large import or sync. Watching the child providers here means expanding
+  /// starts the load and the row list rebuilds when it lands.
+  List<BookmarkRow> _buildRows(
+    WidgetRef ref,
+    BookmarkFolder? folder,
+    BookmarkListUiState uiState,
+    Set<String> expandedGuids, {
+    required int depth,
+  }) {
+    final rows = <BookmarkRow>[];
+
+    for (final item in _visibleChildren(folder, uiState, depth: depth)) {
+      rows.add(BookmarkRow(item, depth));
+
+      if (item is! BookmarkFolder || !expandedGuids.contains(item.guid)) {
+        continue;
+      }
+
+      final child = ref.watch(bookmarkFolderProvider(item.guid));
+      if (child.value == null) {
+        rows.add(BookmarkRow(item, depth + 1, isPlaceholder: true));
+        continue;
+      }
+
+      rows.addAll(
+        _buildRows(ref, child.value, uiState, expandedGuids, depth: depth + 1),
+      );
+    }
+
+    return rows;
+  }
+
+  /// The children of [folder] in display order, with the folders-only filter
+  /// applied.
+  List<BookmarkItem> _visibleChildren(
+    BookmarkFolder? folder,
+    BookmarkListUiState uiState, {
+    required int depth,
+  }) {
+    var children = folder?.children ?? const <BookmarkItem>[];
+
+    if (uiState.foldersOnly) {
+      children = children.whereType<BookmarkFolder>().toList();
+    }
+
+    return sortBookmarkChildren(
+      children,
+      uiState.sortType,
+      // Only the entry level can be the tree root, and only there do the
+      // built-in folders need pinning.
+      isRoot: depth == 0 && entryGuid == BookmarkRoot.root.id,
+    );
+  }
+
+  /// Renders the flattened rows lazily.
+  ///
+  /// [ListView.builder] only builds the tiles actually on screen, so expanding
+  /// a folder with thousands of entries stays as cheap as a small one.
+  Widget _buildRowList(
+    BuildContext context,
+    WidgetRef ref,
+    List<BookmarkRow> rows,
+    BookmarkListUiState uiState,
+    BookmarkListUiStateNotifier uiStateNotifier,
+    ValueNotifier<Set<String>> expandedGuids, {
+    required String emptyLabel,
+  }) {
+    if (rows.isEmpty) {
+      return Center(child: Text(emptyLabel));
+    }
+
+    return ListView.builder(
+      itemCount: rows.length,
+      itemBuilder: (context, index) {
+        final row = rows[index];
+        final item = row.item;
+        final isSelected = uiState.selectedGuids.contains(item.guid);
+
+        return Padding(
+          padding: EdgeInsets.only(left: row.depth * _indentPerDepth),
+          child: row.isPlaceholder
+              ? const Align(
+                  alignment: Alignment.centerLeft,
+                  child: Padding(
+                    padding: EdgeInsets.symmetric(vertical: 12.0),
+                    child: SizedBox(
+                      height: 16.0,
+                      width: 16.0,
+                      child: CircularProgressIndicator(strokeWidth: 2.0),
+                    ),
+                  ),
+                )
+              : switch (item) {
+                  final BookmarkEntry bookmark => _buildEntryTile(
+                    context,
+                    ref,
+                    bookmark,
+                    uiState,
+                    uiStateNotifier,
+                    isSelected,
+                  ),
+                  final BookmarkFolder folder => _buildFolderTile(
+                    context,
+                    ref,
+                    folder,
+                    uiState: uiState,
+                    uiStateNotifier: uiStateNotifier,
+                    isSelected: isSelected,
+                    isExpanded: expandedGuids.value.contains(folder.guid),
+                    onToggleExpanded: () {
+                      final next = {...expandedGuids.value};
+                      if (!next.remove(folder.guid)) next.add(folder.guid);
+                      expandedGuids.value = next;
+                    },
+                  ),
+                },
+        );
+      },
+    );
+  }
+
   // -- App Bars --
 
   PreferredSizeWidget _buildSelectionAppBar(
@@ -239,6 +327,7 @@ class BookmarkListScreen extends HookConsumerWidget {
     WidgetRef ref,
     BookmarkListUiState uiState,
     BookmarkListUiStateNotifier uiStateNotifier,
+    List<BookmarkRow> rows,
   ) {
     final count = uiState.selectedGuids.length;
     return AppBar(
@@ -252,19 +341,21 @@ class BookmarkListScreen extends HookConsumerWidget {
           icon: const Icon(MdiIcons.tabPlus),
           tooltip: 'Open in background',
           onPressed: count > 0
-              ? () => _bulkOpenInBackground(context, ref, uiState)
+              ? () => _bulkOpenInBackground(context, ref, uiState, rows)
               : null,
         ),
         IconButton(
           icon: const Icon(MdiIcons.folderMove),
           tooltip: 'Move selected',
-          onPressed: count > 0 ? () => _bulkMove(context, ref, uiState) : null,
+          onPressed: count > 0
+              ? () => _bulkMove(context, ref, uiState, rows)
+              : null,
         ),
         IconButton(
           icon: const Icon(MdiIcons.delete),
           tooltip: 'Delete selected',
           onPressed: count > 0
-              ? () => _bulkDelete(context, ref, uiState, uiStateNotifier)
+              ? () => _bulkDelete(context, ref, uiState, uiStateNotifier, rows)
               : null,
         ),
       ],
@@ -274,10 +365,8 @@ class BookmarkListScreen extends HookConsumerWidget {
   AppBar _buildNormalAppBar(
     BuildContext context,
     WidgetRef ref,
-    ValueNotifier<TreeViewController<BookmarkItem, TreeNode<BookmarkItem>>?>
-    treeController,
-    ObjectRef<Set<String>> expandedGuids,
     ValueNotifier<bool> hideEmptyRoots,
+    ValueNotifier<Set<String>> expandedGuids,
     ValueNotifier<bool> textFilterEnabled,
     TextEditingController textFilterController,
     BookmarkListUiStateNotifier uiStateNotifier,
@@ -315,21 +404,41 @@ class BookmarkListScreen extends HookConsumerWidget {
           ),
         MenuAnchor(
           menuChildren: [
+            // Adding is otherwise only reachable from a child folder's row
+            // menu, which leaves an empty folder with no way to fill it.
+            // BookmarkRoot.root holds only the built-in folders, so it takes
+            // no children of its own.
+            if (entryGuid != BookmarkRoot.root.id) ...[
+              MenuItemButton(
+                leadingIcon: const Icon(MdiIcons.bookmarkPlus),
+                child: const Text('Add Bookmark Here'),
+                onPressed: () async {
+                  await BookmarkEntryAddRoute(
+                    bookmarkInfo: jsonEncode(
+                      BookmarkInfo(parentGuid: entryGuid).encode(),
+                    ),
+                  ).push(context);
+                },
+              ),
+              MenuItemButton(
+                leadingIcon: const Icon(MdiIcons.folderPlus),
+                child: const Text('Add Subfolder Here'),
+                onPressed: () async {
+                  await BookmarkFolderAddRoute(
+                    parentGuid: entryGuid,
+                  ).push(context);
+                },
+              ),
+            ],
             SubmenuButton(
               leadingIcon: const Icon(MdiIcons.eye),
               menuChildren: [
                 MenuItemButton(
-                  leadingIcon: const Icon(MdiIcons.expandAll),
+                  leadingIcon: const Icon(MdiIcons.collapseAll),
-                  child: const Text('Expand All'),
+                  onPressed: expandedGuids.value.isEmpty
-                  onPressed: () {
+                      ? null
-                    final controller = treeController.value;
+                      : () => expandedGuids.value = <String>{},
-                    if (controller != null) {
+                  child: const Text('Collapse All'),
-                      controller.expandAllChildren(
-                        controller.tree,
-                        recursive: true,
-                      );
-                    }
-                  },
                 ),
                 if (entryGuid == BookmarkRoot.root.id)
                   MenuItemButton(
@@ -353,13 +462,10 @@ class BookmarkListScreen extends HookConsumerWidget {
                         ? MdiIcons.bookmarkMultiple
                         : MdiIcons.folderOutline,
                   ),
+                  onPressed: uiStateNotifier.toggleFoldersOnly,
                   child: Text(
                     uiState.foldersOnly ? 'Show Bookmarks' : 'Folders Only',
                   ),
-                  onPressed: () {
-                    _snapshotExpansion(treeController.value, expandedGuids);
-                    uiStateNotifier.toggleFoldersOnly();
-                  },
                 ),
               ],
               child: const Text('Visibility'),
@@ -373,10 +479,7 @@ class BookmarkListScreen extends HookConsumerWidget {
                         ? const Icon(Icons.check)
                         : const SizedBox(width: 24),
                     child: Text(sortType.label),
-                    onPressed: () {
+                    onPressed: () => uiStateNotifier.setSortType(sortType),
-                      _snapshotExpansion(treeController.value, expandedGuids);
-                      uiStateNotifier.setSortType(sortType);
-                    },
                   ),
               ],
               child: const Text('Sort'),
@@ -387,12 +490,14 @@ class BookmarkListScreen extends HookConsumerWidget {
                 MenuItemButton(
                   leadingIcon: const Icon(MdiIcons.codeJson),
                   child: const Text('JSON'),
-                  onPressed: () => _handleImport(context, ref, 'json'),
+                  onPressed: () =>
+                      _handleImport(context, ref, BookmarkImportFormat.json),
                 ),
                 MenuItemButton(
                   leadingIcon: const Icon(MdiIcons.xml),
                   child: const Text('HTML'),
-                  onPressed: () => _handleImport(context, ref, 'html'),
+                  onPressed: () =>
+                      _handleImport(context, ref, BookmarkImportFormat.html),
                 ),
               ],
               child: const Text('Import'),
@@ -438,7 +543,6 @@ class BookmarkListScreen extends HookConsumerWidget {
     BookmarkListUiState uiState,
     BookmarkListUiStateNotifier uiStateNotifier,
     bool isSelected,
-    BookmarkItem? rootItem,
   ) {
     if (uiState.selectionMode) {
       return ListTile(
@@ -463,7 +567,7 @@ class BookmarkListScreen extends HookConsumerWidget {
       key: ValueKey(bookmark.guid),
       contentPadding: EdgeInsets.zero,
       leading: UrlIcon([bookmark.url], iconSize: 34.0),
-      trailing: _buildEntryMenu(context, ref, bookmark, rootItem),
+      trailing: _buildEntryMenu(context, ref, bookmark),
       title: Text(bookmark.title, maxLines: 3, overflow: TextOverflow.ellipsis),
       subtitle: UriBreadcrumb(uri: bookmark.url),
       onTap: () async {
@@ -487,7 +591,6 @@ class BookmarkListScreen extends HookConsumerWidget {
     BuildContext context,
     WidgetRef ref,
     BookmarkEntry bookmark,
-    BookmarkItem? rootItem,
   ) {
     return HookBuilder(
       builder: (context) {
@@ -605,26 +708,21 @@ class BookmarkListScreen extends HookConsumerWidget {
     BuildContext context,
     WidgetRef ref,
     BookmarkFolder folder, {
-    required bool isLeaf,
-    required bool isExpanded,
     required BookmarkListUiState uiState,
     required BookmarkListUiStateNotifier uiStateNotifier,
     required bool isSelected,
-    required BookmarkItem? rootItem,
+    required bool isExpanded,
+    required VoidCallback onToggleExpanded,
   }) {
     final isRoot = bookmarkRootIds.contains(folder.guid);
 
     if (uiState.selectionMode) {
       return Padding(
         key: ValueKey(folder.guid),
-        padding: isLeaf
+        padding: const EdgeInsets.only(right: 4.0),
-            ? const EdgeInsets.only(right: 4.0)
-            : const EdgeInsets.only(right: 42.0),
         child: ListTile(
           contentPadding: EdgeInsets.zero,
-          leading: isExpanded
+          leading: Icon(isExpanded ? MdiIcons.folderOpen : MdiIcons.folder),
-              ? const Icon(MdiIcons.folderOpen)
-              : const Icon(MdiIcons.folder),
           title: Text(folder.title),
           trailing: isRoot
               ? null
@@ -642,18 +740,21 @@ class BookmarkListScreen extends HookConsumerWidget {
 
     return Padding(
       key: ValueKey(folder.guid),
-      padding: isLeaf
+      padding: const EdgeInsets.only(right: 4.0),
-          ? const EdgeInsets.only(right: 4.0)
-          : const EdgeInsets.only(right: 42.0),
       child: HookBuilder(
         builder: (context) {
           final controller = useMenuController();
 
           return ListTile(
             contentPadding: EdgeInsets.zero,
-            leading: isExpanded
+            // Whether a folder has children is unknown until it is opened, so
-                ? const Icon(MdiIcons.folderOpen)
+            // every folder offers the toggle. Tapping the row still navigates
-                : const Icon(MdiIcons.folder),
+            // into it, as it did before.
+            leading: IconButton(
+              icon: Icon(isExpanded ? MdiIcons.folderOpen : MdiIcons.folder),
+              tooltip: isExpanded ? 'Collapse' : 'Expand',
+              onPressed: onToggleExpanded,
+            ),
             title: Text(folder.title),
             trailing: MenuAnchor(
               controller: controller,
@@ -777,15 +878,14 @@ class BookmarkListScreen extends HookConsumerWidget {
     BuildContext context,
     WidgetRef ref,
     BookmarkListUiState uiState,
+    List<BookmarkRow> rows,
   ) async {
-    final bookmarkData = ref.read(
+    // Not normalised: opening is additive, so a bookmark selected inside an
-      seamlessBookmarksProvider(entryGuid, hideEmptyRoots: true),
+    // also-selected folder should still open rather than be dropped.
-    );
+    final entries = resolveSelectedItems([
-    final root = bookmarkData.value;
+      for (final row in rows)
-    if (root == null) return;
+        if (!row.isPlaceholder) row.item,
-
+    ], uiState.selectedGuids).whereType<BookmarkEntry>().toList();
-    final items = resolveSelectedItems(root, uiState.selectedGuids);
-    final entries = items.whereType<BookmarkEntry>().toList();
 
     if (entries.isEmpty) {
       if (context.mounted) {
@@ -820,18 +920,14 @@ class BookmarkListScreen extends HookConsumerWidget {
     BuildContext context,
     WidgetRef ref,
     BookmarkListUiState uiState,
+    List<BookmarkRow> rows,
   ) async {
-    final bookmarkData = ref.read(
+    final items = _selectedItems(rows, uiState.selectedGuids);
-      seamlessBookmarksProvider(entryGuid, hideEmptyRoots: true),
+    if (items.isEmpty) return;
-    );
-    final root = bookmarkData.value;
-    if (root == null) return;
 
-    final items = resolveSelectedItems(root, uiState.selectedGuids);
+    // A folder cannot be moved inside itself, so exclude each selected folder
-
+    // and its descendants. Fetched from storage rather than read off the list,
-    // Build exclusion set from selected folders and their full descendant
+    // which only knows the level currently on screen.
-    // trees fetched from storage, so hidden folders (e.g. filtered by search)
-    // are still properly excluded as move targets.
     final repo = ref.read(bookmarksRepositoryProvider.notifier);
     final excludeGuids = <String>{};
     for (final item in items) {
@@ -850,18 +946,12 @@ class BookmarkListScreen extends HookConsumerWidget {
 
     if (targetGuid == null) return;
 
-    // Normalize selection to avoid double-moves
+    await repo.moveMany(items: items, targetParentGuid: targetGuid);
-    final normalizedGuids = normalizeSelection(root, uiState.selectedGuids);
-    final normalizedItems = resolveSelectedItems(root, normalizedGuids);
-
-    await ref
-        .read(bookmarksRepositoryProvider.notifier)
-        .moveMany(items: normalizedItems, targetParentGuid: targetGuid);
 
     ref.read(bookmarkListUiStateProvider.notifier).exitSelectionMode();
 
     if (context.mounted) {
-      showInfoMessage(context, 'Moved ${normalizedItems.length} items');
+      showInfoMessage(context, 'Moved ${items.length} items');
     }
   }
 
@@ -870,81 +960,56 @@ class BookmarkListScreen extends HookConsumerWidget {
     WidgetRef ref,
     BookmarkListUiState uiState,
     BookmarkListUiStateNotifier uiStateNotifier,
+    List<BookmarkRow> rows,
   ) async {
-    final bookmarkData = ref.read(
+    final items = _selectedItems(rows, uiState.selectedGuids);
-      seamlessBookmarksProvider(entryGuid, hideEmptyRoots: true),
+    if (items.isEmpty) return;
-    );
-    final root = bookmarkData.value;
-    if (root == null) return;
 
-    final items = resolveSelectedItems(root, uiState.selectedGuids);
+    final folderGuids = items
-    final hasFolders = items.any((item) => item is BookmarkFolder);
+        .whereType<BookmarkFolder>()
+        .map((folder) => folder.guid)
+        .toList();
+
+    // Deleting a folder takes everything under it, which the user cannot see
+    // from here — so say how much before asking.
+    final nestedCount = folderGuids.isEmpty
+        ? 0
+        : await ref
+              .read(bookmarksRepositoryProvider.notifier)
+              .countBookmarksInTrees(folderGuids);
 
     if (!context.mounted) return;
-    final result = await (hasFolders
+    final result = await (folderGuids.isNotEmpty
-        ? showDeleteFolderDialog(context)
+        ? showDeleteFolderDialog(context, bookmarkCount: nestedCount)
         : showDeleteBookmarkDialog(context));
     if (result != true) return;
 
-    // Normalize to avoid deleting children whose parent folder is also being deleted
+    final guids = items.map((item) => item.guid).toSet();
-    final normalizedGuids = normalizeSelection(root, uiState.selectedGuids);
+    await ref.read(bookmarksRepositoryProvider.notifier).deleteMany(guids);
-
-    await ref
-        .read(bookmarksRepositoryProvider.notifier)
-        .deleteMany(normalizedGuids);
 
     uiStateNotifier.exitSelectionMode();
 
     if (context.mounted) {
-      showInfoMessage(context, 'Deleted ${normalizedGuids.length} items');
+      showInfoMessage(context, 'Deleted ${guids.length} items');
     }
   }
 
-  // -- Tree Expansion State Helpers --
+  /// The selected items, with anything nested inside another selected folder
-
+  /// dropped.
-  /// Collects the GUIDs of all currently expanded nodes from the tree.
+  ///
-  void _snapshotExpansion(
+  /// Expanding a folder puts its children on screen next to it, so a user can
-    TreeViewController<BookmarkItem, TreeNode<BookmarkItem>>? controller,
+  /// select both — acting on each in turn would move a child out of the folder
-    ObjectRef<Set<String>> expandedGuids,
+  /// that just moved, or delete it a second time.
+  List<BookmarkItem> _selectedItems(
+    List<BookmarkRow> rows,
+    Set<String> selectedGuids,
   ) {
-    if (controller == null) return;
+    final guids = normalizeSelection(rows, selectedGuids);
-    final guids = <String>{};
-    _collectExpandedGuids(controller.tree, guids);
-    expandedGuids.value = guids;
-  }
 
-  void _collectExpandedGuids(TreeNode<BookmarkItem> node, Set<String> guids) {
+    return resolveSelectedItems([
-    if (node.isExpanded && node.key != INode.ROOT_KEY) {
+      for (final row in rows)
-      guids.add(node.key);
+        if (!row.isPlaceholder) row.item,
-    }
+    ], guids);
-    for (final child in node.childrenAsList) {
-      _collectExpandedGuids(child as TreeNode<BookmarkItem>, guids);
-    }
-  }
-
-  /// Restores expansion state by expanding nodes whose GUIDs are in the set.
-  void _restoreExpansion(
-    TreeViewController<BookmarkItem, TreeNode<BookmarkItem>> controller,
-    TreeNode<BookmarkItem> root,
-    Set<String> guids,
-  ) {
-    // Always expand root
-    controller.expandNode(root);
-    _expandMatchingNodes(controller, root, guids);
-  }
-
-  void _expandMatchingNodes(
-    TreeViewController<BookmarkItem, TreeNode<BookmarkItem>> controller,
-    TreeNode<BookmarkItem> node,
-    Set<String> guids,
-  ) {
-    for (final child in node.childrenAsList) {
-      final typedChild = child as TreeNode<BookmarkItem>;
-      if (guids.contains(typedChild.key)) {
-        controller.expandNode(typedChild);
-      }
-      _expandMatchingNodes(controller, typedChild, guids);
-    }
   }
 
   // -- Tab Opening Helper --
@@ -995,12 +1060,14 @@ class BookmarkListScreen extends HookConsumerWidget {
   Future<void> _handleImport(
     BuildContext context,
     WidgetRef ref,
-    String format,
+    BookmarkImportFormat format,
   ) async {
     try {
       final result = await FilePicker.pickFiles(
         type: FileType.custom,
-        allowedExtensions: format == 'json' ? ['json'] : ['html', 'htm'],
+        allowedExtensions: format == BookmarkImportFormat.json
+            ? ['json']
+            : ['html', 'htm'],
       );
 
       if (result == null || result.files.isEmpty) return;
@@ -1019,12 +1086,15 @@ class BookmarkListScreen extends HookConsumerWidget {
       final shouldReplace = await showImportBookmarksDialog(context);
       if (shouldReplace == null) return; // User cancelled dialog
 
-      final content = await File(file.path!).readAsString();
+      // Reading and parsing happen in a background isolate, so a large file
-      final repository = ref.read(bookmarksRepositoryProvider.notifier);
+      // does not freeze the UI while it is being processed.
-
+      final count = await ref
-      final count = format == 'json'
+          .read(bookmarksRepositoryProvider.notifier)
-          ? await repository.importFromJSON(content, replace: shouldReplace)
+          .importFromFile(
-          : await repository.importFromHTML(content, replace: shouldReplace);
+            path: file.path!,
+            format: format,
+            replace: shouldReplace,
+          );
 
       if (context.mounted) {
         showInfoMessage(context, 'Imported $count bookmarks successfully');

apps/weblibre/lib/features/geckoview/features/bookmarks/presentation/widgets/folder_tree_picker.dart

@@ -17,7 +17,6 @@
  * You should have received a copy of the GNU Affero General Public License
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
-import 'package:animated_tree_view/animated_tree_view.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_hooks/flutter_hooks.dart';
 import 'package:flutter_material_design_icons/flutter_material_design_icons.dart';
@@ -28,11 +27,19 @@ import 'package:weblibre/features/geckoview/features/bookmarks/domain/entities/b
 import 'package:weblibre/features/geckoview/features/bookmarks/domain/providers/bookmarks.dart';
 import 'package:weblibre/presentation/widgets/failure_widget.dart';
 
+/// Indentation applied per level of folder nesting.
+const _indentPerDepth = 20.0;
+
 /// A widget that displays a tree view of bookmark folders and allows the user
 /// to select a parent folder.
 ///
+/// Folders are loaded one level at a time as the user expands them, so opening
+/// the picker never pulls in the whole bookmark tree.
+///
 /// When editing a folder, pass [excludeFolderGuids] to prevent selecting the
-/// folders or their descendants as the parent (which would create a circular reference).
+/// folders or their descendants as the parent (which would create a circular
+/// reference). Descendants are excluded implicitly: an excluded folder is never
+/// rendered, so nothing underneath it can be reached or expanded.
 class FolderTreePicker extends HookConsumerWidget {
   /// The currently selected folder GUID
   final ValueNotifier<String> selectedFolderGuid;
@@ -52,99 +59,39 @@ class FolderTreePicker extends HookConsumerWidget {
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
-    final treeKey = useMemoized(() => GlobalKey<TreeViewState>());
+    // Folders start collapsed apart from the entry point, so the picker opens
+    // after a single shallow load.
+    final expandedGuids = useState(<String>{entryGuid});
 
-    final folderList = ref.watch(bookmarksProvider<BookmarkFolder>(entryGuid));
+    final rootFolder = ref.watch(bookmarkFolderProvider(entryGuid));
 
     return Column(
       crossAxisAlignment: CrossAxisAlignment.start,
       children: [
         Text('Folder', style: Theme.of(context).textTheme.labelMedium),
-        folderList.when(
+        rootFolder.when(
           skipLoadingOnReload: true,
-          data: (list) {
+          data: (folder) {
-            TreeNode<BookmarkFolder> addChildren(
+            if (folder == null) return const SizedBox.shrink();
-              TreeNode<BookmarkFolder>? parent,
-              BookmarkFolder item,
-            ) {
-              final node = TreeNode(key: item.guid, data: item, parent: parent);
-              final targetNode = (parent?..add(node)) ?? node;
 
-              if (item.children != null) {
+            return Column(
-                for (final child in item.children!) {
+              mainAxisSize: MainAxisSize.min,
-                  // Skip excluded folders and their descendants
+              children: [
-                  if (child is BookmarkFolder &&
+                if (entryGuid != BookmarkRoot.root.id)
-                      !excludeFolderGuids.contains(child.guid)) {
+                  _FolderRow(
-                    addChildren(node, child);
+                    folder: folder,
-                  }
+                    depth: 0,
-                }
+                    expandedGuids: expandedGuids,
-              }
+                    selectedFolderGuid: selectedFolderGuid,
-
-              return targetNode;
-            }
-
-            final root = (list != null)
-                ? addChildren(null, list)
-                : TreeNode<BookmarkFolder>.root();
-
-            return TreeView.simple(
-              key: treeKey,
-              tree: root,
-              shrinkWrap: true,
-              showRootNode: entryGuid != BookmarkRoot.root.id,
-              onTreeReady: (controller) {
-                controller.expandAllChildren(root, recursive: true);
-              },
-              expansionIndicatorBuilder: (context, tree) =>
-                  ChevronIndicator.upDown(
-                    tree: tree,
-                    padding: const EdgeInsets.symmetric(
-                      vertical: 16.0,
-                      horizontal: 12.0,
-                    ),
                   ),
-              builder: (context, item) {
+                _FolderChildren(
-                final isSelected = item.data?.guid == selectedFolderGuid.value;
+                  parentGuid: folder.guid,
-
+                  depth: entryGuid != BookmarkRoot.root.id ? 1 : 0,
-                // BookmarkRoot.root cannot be selected as a parent
+                  expandedGuids: expandedGuids,
-                final isRootFolder = item.data?.guid == BookmarkRoot.root.id;
+                  selectedFolderGuid: selectedFolderGuid,
-
+                  excludeFolderGuids: excludeFolderGuids,
-                return Padding(
+                ),
-                  padding: const EdgeInsets.only(right: 42.0),
+              ],
-                  child: switch (item.data) {
-                    final BookmarkFolder folder => ListTile(
-                      key: ValueKey(folder.guid),
-                      contentPadding: EdgeInsets.zero,
-                      selected: isSelected,
-                      enabled: !isRootFolder,
-                      leading: (item.isExpanded)
-                          ? const Icon(MdiIcons.folderOpen)
-                          : const Icon(MdiIcons.folder),
-                      trailing: Row(
-                        mainAxisSize: MainAxisSize.min,
-                        children: [
-                          if (isSelected) const Icon(Icons.check),
-                          IconButton(
-                            onPressed: () async {
-                              await BookmarkFolderAddRoute(
-                                parentGuid: folder.guid,
-                              ).push(context);
-                            },
-                            icon: const Icon(MdiIcons.folderPlus),
-                          ),
-                        ],
-                      ),
-                      title: Text(folder.title),
-                      onTap: !isRootFolder
-                          ? () {
-                              selectedFolderGuid.value = folder.guid;
-                            }
-                          : null,
-                    ),
-                    null => const SizedBox.shrink(),
-                  },
-                );
-              },
             );
           },
           error: (error, stackTrace) => Center(
@@ -152,7 +99,7 @@ class FolderTreePicker extends HookConsumerWidget {
               title: 'Failed to load Bookmark Folders',
               exception: error,
               onRetry: () {
-                ref.invalidate(bookmarksProvider<BookmarkFolder>(entryGuid));
+                ref.invalidate(bookmarkFolderProvider(entryGuid));
               },
             ),
           ),
@@ -162,3 +109,133 @@ class FolderTreePicker extends HookConsumerWidget {
     );
   }
 }
+
+/// The direct subfolders of [parentGuid], rendered only while its parent is
+/// expanded.
+///
+/// Mounting this widget is what triggers the load, so a collapsed folder costs
+/// nothing.
+class _FolderChildren extends HookConsumerWidget {
+  final String parentGuid;
+  final int depth;
+  final ValueNotifier<Set<String>> expandedGuids;
+  final ValueNotifier<String> selectedFolderGuid;
+  final Set<String> excludeFolderGuids;
+
+  const _FolderChildren({
+    required this.parentGuid,
+    required this.depth,
+    required this.expandedGuids,
+    required this.selectedFolderGuid,
+    required this.excludeFolderGuids,
+  });
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final folder = ref.watch(bookmarkFolderProvider(parentGuid));
+
+    final subfolders = (folder.value?.children ?? const <BookmarkItem>[])
+        .whereType<BookmarkFolder>()
+        .where((child) => !excludeFolderGuids.contains(child.guid))
+        .toList();
+
+    if (folder.isLoading && folder.value == null) {
+      return Padding(
+        padding: EdgeInsets.only(left: depth * _indentPerDepth, top: 8.0),
+        child: const Align(
+          alignment: Alignment.centerLeft,
+          child: SizedBox(
+            height: 16.0,
+            width: 16.0,
+            child: CircularProgressIndicator(strokeWidth: 2.0),
+          ),
+        ),
+      );
+    }
+
+    return Column(
+      mainAxisSize: MainAxisSize.min,
+      children: [
+        for (final subfolder in subfolders) ...[
+          _FolderRow(
+            folder: subfolder,
+            depth: depth,
+            expandedGuids: expandedGuids,
+            selectedFolderGuid: selectedFolderGuid,
+          ),
+          if (expandedGuids.value.contains(subfolder.guid))
+            _FolderChildren(
+              parentGuid: subfolder.guid,
+              depth: depth + 1,
+              expandedGuids: expandedGuids,
+              selectedFolderGuid: selectedFolderGuid,
+              excludeFolderGuids: excludeFolderGuids,
+            ),
+        ],
+      ],
+    );
+  }
+}
+
+class _FolderRow extends HookConsumerWidget {
+  final BookmarkFolder folder;
+  final int depth;
+  final ValueNotifier<Set<String>> expandedGuids;
+  final ValueNotifier<String> selectedFolderGuid;
+
+  const _FolderRow({
+    required this.folder,
+    required this.depth,
+    required this.expandedGuids,
+    required this.selectedFolderGuid,
+  });
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final isExpanded = expandedGuids.value.contains(folder.guid);
+    final isSelected = folder.guid == selectedFolderGuid.value;
+
+    // BookmarkRoot.root cannot be selected as a parent
+    final isRootFolder = folder.guid == BookmarkRoot.root.id;
+
+    return Padding(
+      padding: EdgeInsets.only(left: depth * _indentPerDepth, right: 42.0),
+      child: ListTile(
+        key: ValueKey(folder.guid),
+        contentPadding: EdgeInsets.zero,
+        selected: isSelected,
+        enabled: !isRootFolder,
+        // Whether a folder has subfolders is unknown until it is opened, so
+        // every folder offers the toggle.
+        leading: IconButton(
+          icon: Icon(isExpanded ? MdiIcons.folderOpen : MdiIcons.folder),
+          onPressed: () {
+            expandedGuids.value = isExpanded
+                ? ({...expandedGuids.value}..remove(folder.guid))
+                : ({...expandedGuids.value}..add(folder.guid));
+          },
+        ),
+        trailing: Row(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            if (isSelected) const Icon(Icons.check),
+            IconButton(
+              onPressed: () async {
+                await BookmarkFolderAddRoute(
+                  parentGuid: folder.guid,
+                ).push(context);
+              },
+              icon: const Icon(MdiIcons.folderPlus),
+            ),
+          ],
+        ),
+        title: Text(folder.title),
+        onTap: !isRootFolder
+            ? () {
+                selectedFolderGuid.value = folder.guid;
+              }
+            : null,
+      ),
+    );
+  }
+}

apps/weblibre/lib/features/geckoview/features/bookmarks/utils/bookmark_html_utils.dart

@@ -20,7 +20,8 @@
 import 'package:flutter_mozilla_components/flutter_mozilla_components.dart';
 import 'package:html/dom.dart' as dom;
 import 'package:html/parser.dart' as html_parser;
-import 'package:weblibre/core/logger.dart';
+import 'package:weblibre/features/geckoview/features/bookmarks/domain/entities/import_bookmark_node.dart';
+import 'package:weblibre/features/geckoview/features/bookmarks/utils/bookmark_importer.dart';
 
 const _containerNormal = 0;
 const _containerToolbar = 1;
@@ -30,18 +31,22 @@ const _containerPlaces = 4;
 
 const _exportIndent = '    ';
 
-class _Frame {
+/// Parses a Netscape bookmark file into an [ImportBookmarkTree].
-  final Map<String, dynamic> folder;
+///
-  int containerNesting = 0;
+/// Pure and free of platform channels, so it is safe to run inside an isolate;
-  int lastContainerType = _containerNormal;
+/// see `bookmark_import_isolate.dart`.
-  String previousText = '';
+///
-  bool inDescription = false;
+/// When [preserveRootFolders] is set, folders carrying Firefox root markers
-  String? previousLink;
+/// (`PERSONAL_TOOLBAR_FOLDER`, `BOOKMARKS_MENU`, `UNFILED_BOOKMARKS_FOLDER`,
-  Map<String, dynamic>? previousItem;
+/// `PLACES_ROOT`) at the top level are routed to the matching Places root
-  DateTime? previousDateAdded;
+/// instead of being imported as ordinary folders. Everything else lands under
-  DateTime? previousLastModifiedDate;
+/// [BookmarkRoot.menu].
-
+ImportBookmarkTree parseBookmarkHtml(
-  _Frame(this.folder);
+  String htmlString, {
+  required bool preserveRootFolders,
+}) {
+  final parser = _BookmarkHtmlParser(preserveRootFolders: preserveRootFolders);
+  return parser.parse(htmlString);
 }
 
 class BookmarkHTMLUtils {
@@ -50,9 +55,9 @@ class BookmarkHTMLUtils {
   BookmarkHTMLUtils(this._service);
 
   /// Import bookmarks from HTML string
-  Future<int> importFromHTML(String htmlString, {bool replace = false}) async {
+  Future<int> importFromHTML(String htmlString, {bool replace = false}) {
-    final importer = _BookmarkImporter(_service, replace);
+    final tree = parseBookmarkHtml(htmlString, preserveRootFolders: replace);
-    return await importer.importFromHTML(htmlString);
+    return BookmarkTreeImporter(_service).import(tree, replace: replace);
   }
 
   /// Export bookmarks to HTML string
@@ -67,27 +72,80 @@ class BookmarkHTMLUtils {
   }
 }
 
-class _BookmarkImporter {
+/// A node collected while parsing.
-  final GeckoBookmarksService _service;
+///
-  final bool _isImportDefaults;
+/// Folders stay mutable until their closing tag so children can be appended in
-  final Map<String, dynamic> _bookmarkTree;
+/// place; leaves are immutable as soon as they are complete.
+sealed class _ParsedNode {}
+
+final class _ParsedLeaf extends _ParsedNode {
+  final ImportBookmarkNode node;
+
+  _ParsedLeaf(this.node);
+}
+
+final class _ParsedFolder extends _ParsedNode {
+  String title = '';
+
+  /// Set when the folder carried a Firefox root marker, naming the Places root
+  /// its children belong to.
+  String? rootGuid;
+  DateTime? dateAdded;
+  DateTime? lastModified;
+  final List<_ParsedNode> children = [];
+}
+
+/// A bookmark whose `<A>` tag has been opened but whose title text has not been
+/// read yet.
+class _PendingItem {
+  final Uri url;
+  final DateTime? dateAdded;
+  final DateTime? lastModified;
+
+  _PendingItem({required this.url, this.dateAdded, this.lastModified});
+}
+
+class _Frame {
+  final _ParsedFolder folder;
+  int containerNesting = 0;
+  int lastContainerType = _containerNormal;
+  String previousText = '';
+  bool inDescription = false;
+  _PendingItem? pendingItem;
+  DateTime? previousDateAdded;
+  DateTime? previousLastModifiedDate;
+
+  _Frame(this.folder);
+}
+
+class _BookmarkHtmlParser {
+  final bool preserveRootFolders;
+
+  final _ParsedFolder _root = _ParsedFolder();
   final List<_Frame> _frames = [];
 
-  _BookmarkImporter(this._service, this._isImportDefaults)
+  int _bookmarkCount = 0;
-    : _bookmarkTree = {
+  int _folderCount = 0;
-        'type': BookmarkNodeType.folder.index,
+  int _separatorCount = 0;
-        'guid': BookmarkRoot.menu.id,
+  int _skippedUrlCount = 0;
-        'children': <Map<String, dynamic>>[],
+
-      } {
+  _BookmarkHtmlParser({required this.preserveRootFolders}) {
-    _frames.add(_Frame(_bookmarkTree));
+    _frames.add(_Frame(_root));
   }
 
   _Frame get _curFrame => _frames.last;
 
-  Future<int> importFromHTML(String htmlString) async {
+  ImportBookmarkTree parse(String htmlString) {
     final document = html_parser.parse(htmlString);
     _walkTreeForImport(document.body);
-    return await _importBookmarks();
+
+    // Close whatever the document left open so nothing is dropped.
+    while (_frames.length > 1) {
+      _popFrame();
+    }
+    _flushPendingItem();
+
+    return _buildTree();
   }
 
   dom.Node? _nextSibling(dom.Node node) {
@@ -186,29 +244,30 @@ class _BookmarkImporter {
   }
 
   void _handleHeadBegin(dom.Element element) {
-    final frame = _curFrame;
+    // A heading that arrives while the current folder never opened its `<DL>`
-
+    // closes that folder first. Everything below must describe the *new*
-    frame.previousLink = null;
+    // heading, so the frame is only captured once the stack has settled.
-    frame.lastContainerType = _containerNormal;
+    if (_curFrame.containerNesting == 0 && _frames.length > 1) {
-
+      _popFrame();
-    if (frame.containerNesting == 0 && _frames.length > 1) {
-      _frames.removeLast();
     }
 
+    final frame = _curFrame;
+    frame.lastContainerType = _containerNormal;
+
     if (element.attributes.containsKey('personal_toolbar_folder')) {
-      if (_isImportDefaults) {
+      if (preserveRootFolders) {
         frame.lastContainerType = _containerToolbar;
       }
     } else if (element.attributes.containsKey('bookmarks_menu')) {
-      if (_isImportDefaults) {
+      if (preserveRootFolders) {
         frame.lastContainerType = _containerMenu;
       }
     } else if (element.attributes.containsKey('unfiled_bookmarks_folder')) {
-      if (_isImportDefaults) {
+      if (preserveRootFolders) {
         frame.lastContainerType = _containerUnfiled;
       }
     } else if (element.attributes.containsKey('places_root')) {
-      if (_isImportDefaults) {
+      if (preserveRootFolders) {
         frame.lastContainerType = _containerPlaces;
       }
     } else {
@@ -227,67 +286,76 @@ class _BookmarkImporter {
   }
 
   void _handleLinkBegin(dom.Element element) {
-    final frame = _curFrame;
+    // An unterminated `<A>` must not swallow the one that follows it.
+    _flushPendingItem();
 
-    frame.previousItem = null;
+    final frame = _curFrame;
     frame.previousText = '';
 
+    // TAGS, SHORTCUTURL, POST_DATA and LAST_CHARSET are read by Firefox but
+    // have no representation in Places' bookmark storage, so they are dropped.
     final href = element.attributes['href']?.trim();
     final dateAdded = element.attributes['add_date']?.trim();
     final lastModified = element.attributes['last_modified']?.trim();
-    final tags = element.attributes['tags']?.trim();
-    final keyword = element.attributes['shortcuturl']?.trim();
-    final postData = element.attributes['post_data']?.trim();
-    final lastCharset = element.attributes['last_charset']?.trim();
 
     if (href == null || href.isEmpty) {
-      frame.previousLink = null;
+      _skippedUrlCount++;
       return;
     }
 
+    final Uri url;
     try {
       final uri = Uri.parse(href);
       if (!uri.hasScheme) {
-        frame.previousLink = null;
+        _skippedUrlCount++;
         return;
       }
-      frame.previousLink = uri.toString();
+      url = uri;
     } catch (e) {
-      frame.previousLink = null;
+      _skippedUrlCount++;
       return;
     }
 
-    final bookmark = <String, dynamic>{'url': frame.previousLink};
+    final lastModifiedDate = lastModified != null
+        ? _convertImportedDateToInternalDate(lastModified)
+        : null;
 
-    if (dateAdded != null) {
+    frame.pendingItem = _PendingItem(
-      bookmark['dateAdded'] = _convertImportedDateToInternalDate(
+      url: url,
-        dateAdded,
+      // A bookmark that only records a modification time is treated as having
-      ).millisecondsSinceEpoch;
+      // been added then, matching Firefox's own importer.
-    }
+      dateAdded: dateAdded != null
-    if (lastModified != null) {
+          ? _convertImportedDateToInternalDate(dateAdded)
-      bookmark['lastModified'] = _convertImportedDateToInternalDate(
+          : lastModifiedDate,
-        lastModified,
+      lastModified: lastModifiedDate,
-      ).millisecondsSinceEpoch;
+    );
-    }
+  }
-    if (dateAdded == null && lastModified != null) {
-      bookmark['dateAdded'] = bookmark['lastModified'];
-    }
 
-    if (tags != null && tags.isNotEmpty) {
+  /// Materialises the frame's open bookmark, if any, using [title].
-      bookmark['tags'] = tags;
+  void _flushPendingItem({String title = ''}) {
-    }
+    final frame = _curFrame;
-    if (keyword != null && keyword.isNotEmpty) {
+    final pending = frame.pendingItem;
-      bookmark['keyword'] = keyword;
+    if (pending == null) return;
-    }
-    if (postData != null && postData.isNotEmpty) {
-      bookmark['postData'] = postData;
-    }
-    if (lastCharset != null && lastCharset.isNotEmpty) {
-      bookmark['charset'] = lastCharset;
-    }
 
-    (frame.folder['children'] as List).add(bookmark);
+    frame.pendingItem = null;
-    frame.previousItem = bookmark;
+    frame.folder.children.add(
+      _ParsedLeaf(
+        ImportBookmarkItem(
+          url: pending.url,
+          title: title,
+          dateAdded: pending.dateAdded,
+          lastModified: pending.lastModified,
+        ),
+      ),
+    );
+    _bookmarkCount++;
+  }
+
+  /// Completes the innermost folder and hands it to its parent.
+  void _popFrame() {
+    _flushPendingItem();
+    final frame = _frames.removeLast();
+    _curFrame.folder.children.add(frame.folder);
   }
 
   void _handleContainerBegin() {
@@ -300,7 +368,7 @@ class _BookmarkImporter {
       frame.containerNesting--;
     }
     if (_frames.length > 1 && frame.containerNesting == 0) {
-      _frames.removeLast();
+      _popFrame();
     }
   }
 
@@ -310,163 +378,111 @@ class _BookmarkImporter {
 
   void _handleLinkEnd() {
     final frame = _curFrame;
-    frame.previousText = frame.previousText.trim();
+    _flushPendingItem(title: frame.previousText.trim());
-
-    if (frame.previousItem != null) {
-      frame.previousItem!['title'] = frame.previousText;
-    }
-
     frame.previousText = '';
   }
 
   void _handleSeparator() {
-    final frame = _curFrame;
+    _flushPendingItem();
-    final separator = <String, dynamic>{
+    _curFrame.folder.children.add(_ParsedLeaf(const ImportBookmarkSeparator()));
-      'type': BookmarkNodeType.separator.index,
+    _separatorCount++;
-    };
-    (frame.folder['children'] as List).add(separator);
-    frame.previousItem = separator;
   }
 
   void _newFrame() {
+    _flushPendingItem();
+
     final frame = _curFrame;
     final containerTitle = frame.previousText;
     frame.previousText = '';
-    final containerType = frame.lastContainerType;
 
-    final folder = <String, dynamic>{
+    final folder = _ParsedFolder();
-      'children': <Map<String, dynamic>>[],
-      'type': BookmarkNodeType.folder.index,
-    };
 
-    switch (containerType) {
+    switch (frame.lastContainerType) {
       case _containerNormal:
-        folder['title'] = containerTitle;
+        folder.title = containerTitle;
       case _containerPlaces:
-        folder['guid'] = BookmarkRoot.root.id;
+        folder.rootGuid = BookmarkRoot.root.id;
       case _containerMenu:
-        folder['guid'] = BookmarkRoot.menu.id;
+        folder.rootGuid = BookmarkRoot.menu.id;
       case _containerUnfiled:
-        folder['guid'] = BookmarkRoot.unfiled.id;
+        folder.rootGuid = BookmarkRoot.unfiled.id;
       case _containerToolbar:
-        folder['guid'] = BookmarkRoot.toolbar.id;
+        folder.rootGuid = BookmarkRoot.toolbar.id;
     }
 
-    (frame.folder['children'] as List).add(folder);
+    folder.lastModified = frame.previousLastModifiedDate;
+    // As for items, a folder that only records a modification time is treated
+    // as having been created then.
+    folder.dateAdded = frame.previousDateAdded ?? folder.lastModified;
+    frame.previousDateAdded = null;
+    frame.previousLastModifiedDate = null;
 
-    if (frame.previousDateAdded != null) {
-      folder['dateAdded'] = frame.previousDateAdded!.millisecondsSinceEpoch;
-      frame.previousDateAdded = null;
-    }
-    if (frame.previousLastModifiedDate != null) {
-      folder['lastModified'] =
-          frame.previousLastModifiedDate!.millisecondsSinceEpoch;
-      frame.previousLastModifiedDate = null;
-    }
-    if (!folder.containsKey('dateAdded') &&
-        folder.containsKey('lastModified')) {
-      folder['dateAdded'] = folder['lastModified'];
-    }
-
-    frame.previousItem = folder;
     _frames.add(_Frame(folder));
   }
 
   DateTime _convertImportedDateToInternalDate(String seconds) {
-    try {
+    final parsed = int.tryParse(seconds);
-      final parsed = int.tryParse(seconds);
+    if (parsed != null) {
-      if (parsed != null) {
+      return DateTime.fromMillisecondsSinceEpoch(parsed * 1000);
-        return DateTime.fromMillisecondsSinceEpoch(parsed * 1000);
-      }
-    } catch (e) {
-      // Fall through
     }
     return DateTime.now();
   }
 
-  List<Map<String, dynamic>> _getBookmarkTrees() {
+  /// Groups the parsed top level into per-root sections.
-    if (!_isImportDefaults) {
+  ///
-      return [_bookmarkTree];
+  /// Only top-level folders carrying a root marker are routed to their own
+  /// Places root; a marker deeper in the file describes a folder that Firefox
+  /// itself would have nested, so it is imported as an ordinary (untitled)
+  /// folder.
+  ImportBookmarkTree _buildTree() {
+    final menuNodes = <ImportBookmarkNode>[];
+    final rootSections = <String, List<ImportBookmarkNode>>{};
+
+    for (final child in _root.children) {
+      if (child is _ParsedFolder && child.rootGuid != null) {
+        rootSections
+            .putIfAbsent(child.rootGuid!, () => <ImportBookmarkNode>[])
+            .addAll(child.children.map(_toImmutable));
+      } else {
+        menuNodes.add(_toImmutable(child));
+      }
     }
 
-    final bookmarkTrees = <Map<String, dynamic>>[_bookmarkTree];
+    final sections = <String, List<ImportBookmarkNode>>{
-    final children = _bookmarkTree['children'] as List<Map<String, dynamic>>;
+      if (menuNodes.isNotEmpty) BookmarkRoot.menu.id: menuNodes,
+    };
+    for (final section in rootSections.entries) {
+      sections.update(
+        section.key,
+        (existing) => existing..addAll(section.value),
+        ifAbsent: () => section.value,
+      );
+    }
 
-    _bookmarkTree['children'] = children.where((child) {
+    return ImportBookmarkTree(
-      final guid = child['guid'] as String?;
+      sections: sections,
-      if (guid != null && bookmarkRootIds.contains(guid)) {
+      stats: ImportBookmarkStats(
-        bookmarkTrees.add(child);
+        bookmarkCount: _bookmarkCount,
-        return false;
+        folderCount: _folderCount,
-      }
+        separatorCount: _separatorCount,
-      return true;
+        skippedUrlCount: _skippedUrlCount,
-    }).toList();
+      ),
-
+    );
-    return bookmarkTrees;
   }
 
-  Future<int> _importBookmarks() async {
+  ImportBookmarkNode _toImmutable(_ParsedNode node) {
-    if (_isImportDefaults) {
+    switch (node) {
-      // Delete bookmarks from each root folder (except root itself to avoid errors)
+      case final _ParsedLeaf leaf:
-      for (final root in BookmarkRoot.values) {
+        return leaf.node;
-        if (root != BookmarkRoot.root) {
+      case final _ParsedFolder folder:
-          await _service.eraseEverything(root);
+        _folderCount++;
-        }
+        return ImportBookmarkFolder(
-      }
+          title: folder.title,
+          children: folder.children.map(_toImmutable).toList(),
+          dateAdded: folder.dateAdded,
+          lastModified: folder.lastModified,
+        );
     }
-
-    final bookmarkTrees = _getBookmarkTrees();
-    int bookmarkCount = 0;
-
-    for (final tree in bookmarkTrees) {
-      final children = tree['children'] as List?;
-      if (children == null || children.isEmpty) continue;
-
-      bookmarkCount += await _insertTree(tree);
-    }
-
-    return bookmarkCount;
-  }
-
-  Future<int> _insertTree(Map<String, dynamic> node) async {
-    int count = 0;
-    final children = node['children'] as List?;
-
-    if (children == null || children.isEmpty) return 0;
-
-    final parentGuid = node['guid'] as String;
-
-    for (int i = 0; i < children.length; i++) {
-      final child = children[i] as Map<String, dynamic>;
-      final type = child['type'] as int? ?? BookmarkNodeType.item.index;
-
-      if (type == BookmarkNodeType.item.index) {
-        final url = child['url'] as String?;
-        final title = child['title'] as String? ?? '';
-
-        if (url != null && url.isNotEmpty) {
-          try {
-            final uri = Uri.parse(url);
-            if (uri.hasScheme) {
-              await _service.addItem(parentGuid, uri, title, i);
-              count++;
-            }
-          } catch (e) {
-            logger.e('Failed to import bookmark "$title": $e');
-          }
-        }
-      } else if (type == BookmarkNodeType.folder.index) {
-        final title = child['title'] as String? ?? '';
-        try {
-          final newGuid = await _service.addFolder(parentGuid, title, i);
-          child['guid'] = newGuid;
-          count += await _insertTree(child);
-        } catch (e) {
-          logger.e('Failed to import folder "$title": $e');
-        }
-      }
-    }
-
-    return count;
   }
 }
 

apps/weblibre/lib/features/geckoview/features/bookmarks/utils/bookmark_import_isolate.dart

@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2024-2026 Fabian Freund.
+ *
+ * This file is part of WebLibre
+ * (see https://weblibre.eu).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+import 'dart:io';
+import 'dart:isolate';
+
+import 'package:weblibre/features/geckoview/features/bookmarks/domain/entities/import_bookmark_node.dart';
+import 'package:weblibre/features/geckoview/features/bookmarks/utils/bookmark_html_utils.dart';
+import 'package:weblibre/features/geckoview/features/bookmarks/utils/bookmark_json_utils.dart';
+
+/// The bookmark file formats WebLibre can read.
+enum BookmarkImportFormat { html, json }
+
+/// Reads and parses the bookmark file at [path] in a background isolate.
+///
+/// Both the file read and the parse happen off the UI isolate, so a large
+/// export — the reported problem case is around 25k bookmarks — does not block
+/// frames. Only the resulting [ImportBookmarkTree] crosses back, which is far
+/// smaller than the HTML DOM or decoded JSON it was built from.
+///
+/// The file is read inside the isolate rather than handed over as a string, so
+/// the UI isolate never holds the raw document in memory.
+Future<ImportBookmarkTree> parseBookmarkFile({
+  required String path,
+  required BookmarkImportFormat format,
+  required bool preserveRootFolders,
+}) {
+  return Isolate.run(
+    () => _parseBookmarkFile(path, format, preserveRootFolders),
+    debugName: 'bookmark-import-parse',
+  );
+}
+
+/// Runs inside the spawned isolate; must stay free of platform channels and of
+/// anything tied to the UI isolate's state.
+ImportBookmarkTree _parseBookmarkFile(
+  String path,
+  BookmarkImportFormat format,
+  bool preserveRootFolders,
+) {
+  final content = File(path).readAsStringSync();
+
+  return switch (format) {
+    BookmarkImportFormat.html => parseBookmarkHtml(
+      content,
+      preserveRootFolders: preserveRootFolders,
+    ),
+    BookmarkImportFormat.json => parseBookmarkJson(content),
+  };
+}

apps/weblibre/lib/features/geckoview/features/bookmarks/utils/bookmark_importer.dart

@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2024-2026 Fabian Freund.
+ *
+ * This file is part of WebLibre
+ * (see https://weblibre.eu).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+import 'package:flutter_mozilla_components/flutter_mozilla_components.dart';
+import 'package:weblibre/core/logger.dart';
+import 'package:weblibre/features/geckoview/features/bookmarks/domain/entities/import_bookmark_node.dart';
+
+/// Writes a parsed [ImportBookmarkTree] into Places.
+///
+/// Insertion is bulk: one native call per destination root, with each top-level
+/// folder written as a single storage tree insertion. A 25k-bookmark file
+/// therefore costs a handful of platform channel round trips rather than one
+/// per node.
+class BookmarkTreeImporter {
+  final GeckoBookmarksService _service;
+
+  const BookmarkTreeImporter(this._service);
+
+  /// Inserts [tree] and returns the number of bookmark items written.
+  ///
+  /// When [replace] is set every root except [BookmarkRoot.root] is emptied
+  /// first; the root itself is never deleted. A tree that parsed to nothing
+  /// erases nothing either, so a malformed or empty file cannot wipe the
+  /// user's bookmarks and leave them with an empty library.
+  Future<int> import(ImportBookmarkTree tree, {required bool replace}) async {
+    if (tree.isEmpty) return 0;
+
+    if (replace) {
+      for (final root in BookmarkRoot.values) {
+        if (root != BookmarkRoot.root) {
+          await _service.eraseEverything(root);
+        }
+      }
+    }
+
+    var importedCount = 0;
+
+    for (final section in tree.sections.entries) {
+      if (section.value.isEmpty) continue;
+
+      final result = await _service.insertTree(
+        section.key,
+        section.value.map(toPigeonImportNode).toList(),
+      );
+
+      importedCount += result.insertedItemCount;
+
+      if (result.failedNodeCount > 0) {
+        logger.e(
+          'Failed to import ${result.failedNodeCount} top-level nodes into ${section.key}',
+        );
+      }
+    }
+
+    return importedCount;
+  }
+}
+
+/// Converts a parsed node into the Pigeon transport type.
+///
+/// Timestamps become milliseconds since epoch, with 0 standing in for "the file
+/// did not say", which is what Places expects for an unknown timestamp.
+BookmarkImportNode toPigeonImportNode(ImportBookmarkNode node) {
+  return switch (node) {
+    final ImportBookmarkFolder folder => BookmarkImportNode(
+      type: BookmarkNodeType.folder,
+      title: folder.title,
+      url: null,
+      dateAdded: _toMillis(folder.dateAdded),
+      lastModified: _toMillis(folder.lastModified),
+      children: folder.children.map(toPigeonImportNode).toList(),
+    ),
+    final ImportBookmarkItem item => BookmarkImportNode(
+      type: BookmarkNodeType.item,
+      title: item.title,
+      url: item.url.toString(),
+      dateAdded: _toMillis(item.dateAdded),
+      lastModified: _toMillis(item.lastModified),
+      children: const [],
+    ),
+    final ImportBookmarkSeparator separator => BookmarkImportNode(
+      type: BookmarkNodeType.separator,
+      title: null,
+      url: null,
+      dateAdded: _toMillis(separator.dateAdded),
+      lastModified: _toMillis(separator.lastModified),
+      children: const [],
+    ),
+  };
+}
+
+int _toMillis(DateTime? value) => value?.millisecondsSinceEpoch ?? 0;

apps/weblibre/lib/features/geckoview/features/bookmarks/utils/bookmark_json_utils.dart

@@ -23,8 +23,28 @@
 import 'dart:convert';
 import 'package:flutter_mozilla_components/flutter_mozilla_components.dart';
 import 'package:weblibre/core/logger.dart';
+import 'package:weblibre/features/geckoview/features/bookmarks/domain/entities/import_bookmark_node.dart';
+import 'package:weblibre/features/geckoview/features/bookmarks/utils/bookmark_importer.dart';
 import 'package:weblibre/utils/uri_input_parser.dart';
 
+/// Parses a Firefox JSON bookmark backup into an [ImportBookmarkTree].
+///
+/// Pure and free of platform channels, so it is safe to run inside an isolate;
+/// see `bookmark_import_isolate.dart`.
+///
+/// Only top-level nodes that identify themselves as a Places root are imported,
+/// each into its matching root. `place:` query URLs have their folder ids
+/// rewritten to guids, and the tags folder is ignored.
+ImportBookmarkTree parseBookmarkJson(String jsonString) {
+  final data = jsonDecode(jsonString);
+
+  if (data is! Map<String, dynamic>) {
+    throw const FormatException('Invalid JSON format');
+  }
+
+  return const _BookmarkJsonParser().parse(data);
+}
+
 class BookmarkJSONUtils {
   final GeckoBookmarksService _service;
 
@@ -33,18 +53,10 @@ class BookmarkJSONUtils {
   /// Import bookmarks from JSON string
   Future<int> importFromJSON(String jsonString, {bool replace = false}) async {
     try {
-      final data = jsonDecode(jsonString);
+      final tree = parseBookmarkJson(jsonString);
-
+      return await BookmarkTreeImporter(
-      if (data is! Map<String, dynamic>) {
+        _service,
-        throw Exception('Invalid JSON format');
+      ).import(tree, replace: replace);
-      }
-
-      final children = data['children'] as List?;
-      if (children == null || children.isEmpty) {
-        return 0;
-      }
-
-      return await _import(data, replace: replace);
     } catch (ex) {
       logger.e('Failed to import bookmarks: $ex');
       rethrow;
@@ -63,206 +75,6 @@ class BookmarkJSONUtils {
     return _nodeToJson(tree, isRoot: true);
   }
 
-  /// Import implementation
-  Future<int> _import(
-    Map<String, dynamic> rootNode, {
-    required bool replace,
-  }) async {
-    final nodes =
-        (rootNode['children'] as List?)
-            ?.whereType<Map<String, dynamic>>()
-            .where(
-              (node) =>
-                  node['root'] != 'tagsFolder' &&
-                  node['guid'] != 'tags________',
-            )
-            .toList() ??
-        [];
-
-    if (nodes.isEmpty) {
-      return 0;
-    }
-
-    // If replacing, erase existing bookmarks first
-    if (replace) {
-      // Delete bookmarks from each root folder (except root itself to avoid errors)
-      for (final root in BookmarkRoot.values) {
-        if (root != BookmarkRoot.root) {
-          await _service.eraseEverything(root);
-        }
-      }
-    }
-
-    final folderIdToGuidMap = <String, String>{};
-
-    // Translate tree types and build folder map
-    for (final node in nodes) {
-      if (node['children'] == null || (node['children'] as List).isEmpty) {
-        continue;
-      }
-
-      final folders = _translateTreeTypes(node);
-      folderIdToGuidMap.addAll(folders);
-    }
-
-    int bookmarkCount = 0;
-
-    // Insert nodes
-    for (final node in nodes) {
-      if (node['children'] == null || (node['children'] as List).isEmpty) {
-        continue;
-      }
-
-      final guid = node['guid'] as String?;
-      if (guid == null || !bookmarkRootIds.contains(guid)) {
-        continue;
-      }
-
-      _fixupSearchQueries(node, folderIdToGuidMap);
-
-      // Insert the tree recursively
-      bookmarkCount += await _insertTree(node, folderIdToGuidMap);
-    }
-
-    return bookmarkCount;
-  }
-
-  /// Recursively insert bookmark tree
-  Future<int> _insertTree(
-    Map<String, dynamic> node,
-    Map<String, String> folderIdToGuidMap,
-  ) async {
-    int count = 0;
-    final children = node['children'] as List?;
-
-    if (children == null || children.isEmpty) {
-      return 0;
-    }
-
-    final parentGuid = node['guid'] as String;
-
-    for (int i = 0; i < children.length; i++) {
-      final child = children[i] as Map<String, dynamic>;
-      final type = _getNodeType(child);
-
-      if (type == BookmarkNodeType.item) {
-        final url = _getNodeUrl(child);
-        final title = child['title'] as String? ?? '';
-
-        if (url != null && url.isNotEmpty) {
-          try {
-            // Validate URL before inserting
-            final uri = Uri.tryParse(url);
-            if (uri != null && uri.hasScheme) {
-              await _service.addItem(parentGuid, uri, title, i);
-              count++;
-            } else {
-              final parsed = Uri.tryParse(url);
-              final redacted = parsed != null
-                  ? redactUriCredentials(parsed)
-                  : url;
-              logger.w('Skipping invalid URL: $redacted');
-            }
-          } catch (e) {
-            logger.e('Failed to import bookmark "$title": $e');
-          }
-        }
-      } else if (type == BookmarkNodeType.folder) {
-        final title = child['title'] as String? ?? '';
-        try {
-          final newGuid = await _service.addFolder(parentGuid, title, i);
-          child['guid'] = newGuid;
-
-          // Recursively insert children
-          count += await _insertTree(child, folderIdToGuidMap);
-        } catch (e) {
-          logger.e('Failed to import folder "$title": $e');
-        }
-      }
-      // Note: Separators are not supported by the Android API
-    }
-
-    return count;
-  }
-
-  /// Translate tree types from JSON format to internal format
-  Map<String, String> _translateTreeTypes(Map<String, dynamic> node) {
-    final folderIdToGuidMap = <String, String>{};
-
-    _normalizeNodeUrl(node);
-
-    final type = node['type'];
-    if (type == 'text/x-moz-place-container') {
-      node['type'] = BookmarkNodeType.folder.index;
-
-      final id = node['id']?.toString();
-      final guid = node['guid'] as String?;
-      if (id != null && guid != null) {
-        folderIdToGuidMap[id] = guid;
-      }
-    } else if (type == 'text/x-moz-place') {
-      node['type'] = BookmarkNodeType.item.index;
-    } else if (type == 'text/x-moz-place-separator') {
-      node['type'] = BookmarkNodeType.separator.index;
-      node.remove('title');
-    }
-
-    final children = node['children'] as List?;
-    if (children != null) {
-      for (final child in children) {
-        if (child is Map<String, dynamic>) {
-          folderIdToGuidMap.addAll(_translateTreeTypes(child));
-        }
-      }
-    }
-
-    return folderIdToGuidMap;
-  }
-
-  /// Fix up search queries with folder mappings
-  void _fixupSearchQueries(
-    Map<String, dynamic> node,
-    Map<String, String> folderIdToGuidMap,
-  ) {
-    final url = _getNodeUrl(node);
-    if (url != null && url.startsWith('place:')) {
-      node['url'] = _fixupQuery(url, folderIdToGuidMap);
-    }
-
-    final children = node['children'] as List?;
-    if (children != null) {
-      for (final child in children) {
-        if (child is Map<String, dynamic>) {
-          _fixupSearchQueries(child, folderIdToGuidMap);
-        }
-      }
-    }
-  }
-
-  /// Replace folder IDs with GUIDs in place: URIs
-  String _fixupQuery(String queryURL, Map<String, String> folderIdToGuidMap) {
-    final regex = RegExp(r'folder=([A-Za-z0-9_]+)');
-    bool invalid = false;
-
-    final result = queryURL.replaceAllMapped(regex, (match) {
-      final folderId = match.group(1)!;
-      final guid = folderIdToGuidMap[folderId];
-
-      if (guid == null) {
-        invalid = true;
-        return 'invalidOldParentId=$folderId';
-      }
-
-      return 'parent=$guid';
-    });
-
-    if (invalid) {
-      return '$result&excludeItems=1';
-    }
-
-    return result;
-  }
-
   /// Convert BookmarkNode to JSON (for export)
   Map<String, dynamic>? _nodeToJson(BookmarkNode node, {bool isRoot = false}) {
     // Skip invalid bookmarks
@@ -344,20 +156,188 @@ class BookmarkJSONUtils {
     if (guid == BookmarkRoot.mobile.id) return 'mobileFolder';
     return null;
   }
+}
+
+/// Running totals collected while converting a JSON backup.
+class _Counters {
+  int bookmarks = 0;
+  int folders = 0;
+  int separators = 0;
+  int skippedUrls = 0;
+}
+
+class _BookmarkJsonParser {
+  const _BookmarkJsonParser();
+
+  ImportBookmarkTree parse(Map<String, dynamic> data) {
+    final nodes =
+        (data['children'] as List?)
+            ?.whereType<Map<String, dynamic>>()
+            .where(
+              (node) =>
+                  node['root'] != 'tagsFolder' &&
+                  node['guid'] != 'tags________',
+            )
+            .toList() ??
+        const [];
+
+    // `place:` query URLs reference folders by numeric id, which is meaningless
+    // once imported. Collect every id -> guid pair up front, including from
+    // sections that are not themselves imported, so the rewrite below can
+    // resolve references that point across roots.
+    final folderIdToGuid = <String, String>{};
+    for (final node in nodes) {
+      if (_childrenOf(node).isEmpty) continue;
+      _collectFolderGuids(node, folderIdToGuid);
+    }
+
+    final counters = _Counters();
+    final sections = <String, List<ImportBookmarkNode>>{};
+
+    for (final node in nodes) {
+      final children = _childrenOf(node);
+      if (children.isEmpty) continue;
+
+      // Anything that does not name a Places root has nowhere to go: a backup
+      // always describes its roots explicitly.
+      final guid = node['guid'] as String?;
+      if (guid == null || !bookmarkRootIds.contains(guid)) continue;
+
+      final converted = <ImportBookmarkNode>[];
+      for (final child in children) {
+        final node = _convert(child, folderIdToGuid, counters);
+        if (node != null) converted.add(node);
+      }
+
+      if (converted.isEmpty) continue;
+      sections
+          .putIfAbsent(guid, () => <ImportBookmarkNode>[])
+          .addAll(converted);
+    }
+
+    return ImportBookmarkTree(
+      sections: sections,
+      stats: ImportBookmarkStats(
+        bookmarkCount: counters.bookmarks,
+        folderCount: counters.folders,
+        separatorCount: counters.separators,
+        skippedUrlCount: counters.skippedUrls,
+      ),
+    );
+  }
+
+  ImportBookmarkNode? _convert(
+    Map<String, dynamic> node,
+    Map<String, String> folderIdToGuid,
+    _Counters counters,
+  ) {
+    final dateAdded = _parseTimestamp(node['dateAdded']);
+    final lastModified = _parseTimestamp(node['lastModified']);
+
+    switch (_getNodeType(node)) {
+      case BookmarkNodeType.folder:
+        final children = <ImportBookmarkNode>[];
+        for (final child in _childrenOf(node)) {
+          final converted = _convert(child, folderIdToGuid, counters);
+          if (converted != null) children.add(converted);
+        }
+        counters.folders++;
+        return ImportBookmarkFolder(
+          title: node['title'] as String? ?? '',
+          children: children,
+          dateAdded: dateAdded,
+          lastModified: lastModified,
+        );
+
+      case BookmarkNodeType.item:
+        var url = _getNodeUrl(node);
+        if (url == null || url.isEmpty) {
+          counters.skippedUrls++;
+          return null;
+        }
+        if (url.startsWith('place:')) {
+          url = _fixupQuery(url, folderIdToGuid);
+        }
+
+        final uri = Uri.tryParse(url);
+        if (uri == null || !uri.hasScheme) {
+          counters.skippedUrls++;
+          logger.w(
+            'Skipping invalid URL: ${uri != null ? redactUriCredentials(uri) : url}',
+          );
+          return null;
+        }
+
+        counters.bookmarks++;
+        return ImportBookmarkItem(
+          url: uri,
+          title: node['title'] as String? ?? '',
+          dateAdded: dateAdded,
+          lastModified: lastModified,
+        );
+
+      case BookmarkNodeType.separator:
+        counters.separators++;
+        return ImportBookmarkSeparator(
+          dateAdded: dateAdded,
+          lastModified: lastModified,
+        );
+    }
+  }
+
+  void _collectFolderGuids(
+    Map<String, dynamic> node,
+    Map<String, String> folderIdToGuid,
+  ) {
+    if (node['type'] == 'text/x-moz-place-container') {
+      final id = node['id']?.toString();
+      final guid = node['guid'] as String?;
+      if (id != null && guid != null) {
+        folderIdToGuid[id] = guid;
+      }
+    }
+
+    for (final child in _childrenOf(node)) {
+      _collectFolderGuids(child, folderIdToGuid);
+    }
+  }
+
+  List<Map<String, dynamic>> _childrenOf(Map<String, dynamic> node) {
+    return (node['children'] as List?)
+            ?.whereType<Map<String, dynamic>>()
+            .toList() ??
+        const [];
+  }
+
+  /// Replace folder IDs with GUIDs in place: URIs
+  String _fixupQuery(String queryURL, Map<String, String> folderIdToGuidMap) {
+    final regex = RegExp(r'folder=([A-Za-z0-9_]+)');
+    bool invalid = false;
+
+    final result = queryURL.replaceAllMapped(regex, (match) {
+      final folderId = match.group(1)!;
+      final guid = folderIdToGuidMap[folderId];
+
+      if (guid == null) {
+        invalid = true;
+        return 'invalidOldParentId=$folderId';
+      }
+
+      return 'parent=$guid';
+    });
+
+    if (invalid) {
+      return '$result&excludeItems=1';
+    }
+
+    return result;
+  }
 
   /// Get URL from node (accepts both 'url' and 'uri')
   String? _getNodeUrl(Map<String, dynamic> node) {
     return node['url'] as String? ?? node['uri'] as String?;
   }
 
-  /// Normalize 'uri' to 'url' during import
-  void _normalizeNodeUrl(Map<String, dynamic> node) {
-    if (node.containsKey('uri')) {
-      node['url'] = node['uri'];
-      node.remove('uri');
-    }
-  }
-
   /// Get node type from JSON
   BookmarkNodeType _getNodeType(Map<String, dynamic> node) {
     final type = node['type'];
@@ -373,4 +353,21 @@ class BookmarkJSONUtils {
       return BookmarkNodeType.separator;
     }
   }
+
+  /// Reads a backup timestamp, which may be in either unit.
+  ///
+  /// Firefox writes PRTime (microseconds), while WebLibre's own JSON export
+  /// writes Places' native milliseconds. Any microsecond value for a date after
+  /// ~1973 exceeds [_microsecondThreshold], whereas a millisecond value would
+  /// have to be a date past the year 5138 to reach it.
+  static const _microsecondThreshold = 100000000000000;
+
+  DateTime? _parseTimestamp(Object? value) {
+    final raw = value is int ? value : int.tryParse(value?.toString() ?? '');
+    if (raw == null || raw <= 0) return null;
+
+    return DateTime.fromMillisecondsSinceEpoch(
+      raw > _microsecondThreshold ? raw ~/ 1000 : raw,
+    );
+  }
 }

apps/weblibre/lib/features/geckoview/features/browser/features/contextual_toolbar/presentation/toolbar_button_registry.dart

@@ -17,7 +17,6 @@
  * You should have received a copy of the GNU Affero General Public License
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
-import 'package:fast_equatable/fast_equatable.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_hooks/flutter_hooks.dart';
 import 'package:flutter_material_design_icons/flutter_material_design_icons.dart';
@@ -31,8 +30,8 @@ import 'package:weblibre/features/geckoview/domain/providers/tab_session.dart';
 import 'package:weblibre/features/geckoview/domain/providers/tab_state.dart';
 import 'package:weblibre/features/geckoview/domain/providers/web_extensions_state.dart';
 import 'package:weblibre/features/geckoview/domain/repositories/tab.dart';
+import 'package:weblibre/features/geckoview/features/bookmarks/domain/providers/bookmarks.dart';
 import 'package:weblibre/features/geckoview/features/bookmarks/domain/repositories/bookmarks.dart';
-import 'package:weblibre/features/geckoview/features/bookmarks/domain/utils/bookmark_tree_utils.dart';
 import 'package:weblibre/features/geckoview/features/browser/domain/entities/font_size_constants.dart';
 import 'package:weblibre/features/geckoview/features/browser/features/contextual_toolbar/data/providers/toolbar_button_configs.dart';
 import 'package:weblibre/features/geckoview/features/browser/features/contextual_toolbar/domain/entities/toolbar_button_id.dart';
@@ -783,18 +782,16 @@ class _BookmarkToolbarButton extends HookConsumerWidget {
     final tabUrl = scope.tabState?.url;
     final bookmarkable = tabUrl != null && !scope.isPreview;
 
-    final existingGuids = ref
+    // Answered by a storage lookup keyed on the URL, so this does not depend on
-        .watch(
+    // the whole bookmark tree being resident in memory.
-          bookmarksRepositoryProvider.select(
+    final bookmarkLookup = ref.watch(
-            (async) => EquatableValue(
+      bookmarkGuidsForUrlProvider(bookmarkable ? tabUrl : null),
-              bookmarkable
+    );
-                  ? bookmarkGuidsForUrl(async.value, tabUrl)
+    final existingGuids = bookmarkLookup.value ?? const <String>[];
-                  : const <String>[],
-            ),
-          ),
-        )
-        .value;
 
+    // Until the lookup settles an existing bookmark is indistinguishable from
+    // none, and assuming none would let a quick tap add a second copy.
+    final canToggleBookmark = bookmarkable && bookmarkLookup.hasValue;
     final isBookmarked = existingGuids.isNotEmpty;
 
     return MenuAnchor(
@@ -819,7 +816,7 @@ class _BookmarkToolbarButton extends HookConsumerWidget {
         else
           MenuItemButton(
             leadingIcon: const Icon(MdiIcons.bookmarkPlus),
-            onPressed: !bookmarkable
+            onPressed: !canToggleBookmark
                 ? null
                 : () async {
                     await ref
@@ -869,25 +866,23 @@ class _BookmarkToggleToolbarButton extends ConsumerWidget {
   Widget build(BuildContext context, WidgetRef ref) {
     final tabUrl = scope.tabState?.url;
     final bookmarkable = tabUrl != null && !scope.isPreview;
-    final existingGuids = ref
+    // Answered by a storage lookup keyed on the URL, so this does not depend on
-        .watch(
+    // the whole bookmark tree being resident in memory.
-          bookmarksRepositoryProvider.select(
+    final bookmarkLookup = ref.watch(
-            (async) => EquatableValue(
+      bookmarkGuidsForUrlProvider(bookmarkable ? tabUrl : null),
-              bookmarkable
+    );
-                  ? bookmarkGuidsForUrl(async.value, tabUrl)
+    final existingGuids = bookmarkLookup.value ?? const <String>[];
-                  : const <String>[],
-            ),
-          ),
-        )
-        .value;
 
+    // Until the lookup settles an existing bookmark is indistinguishable from
+    // none, and assuming none would let a quick tap add a second copy.
+    final canToggleBookmark = bookmarkable && bookmarkLookup.hasValue;
     final isBookmarked = existingGuids.isNotEmpty;
 
     return IconButton(
       tooltip: isBookmarked ? 'Remove bookmark' : 'Add bookmark',
       onPressed: scope.isPreview
           ? () {}
-          : !bookmarkable
+          : !canToggleBookmark
           ? null
           : () async {
               if (isBookmarked) {

apps/weblibre/lib/features/geckoview/features/browser/presentation/widgets/browser_modules/app_bar_title.dart

@@ -628,7 +628,8 @@ class RailAppBarTitleView extends StatelessWidget {
                         : MdiIcons.shieldAlert,
                     size: 10,
                     color:
-                        siteSettingsBadgeState == SiteSettingsBadgeState.improved
+                        siteSettingsBadgeState ==
+                            SiteSettingsBadgeState.improved
                         ? Colors.green
                         : appColors.warningAmber,
                   ),

apps/weblibre/lib/features/geckoview/features/browser/presentation/widgets/browser_modules/quick_tab_switcher_accordion.dart

@@ -317,7 +317,9 @@ class AccordionQuickTabSwitcher extends HookConsumerWidget {
     if (entries.isEmpty) {
       // Hold the 48px slot; the bar visibility is decided upstream by
       // quickTabSwitcherRowCountProvider.
-      return isVertical ? const SizedBox(width: 48) : const SizedBox(height: 48);
+      return isVertical
+          ? const SizedBox(width: 48)
+          : const SizedBox(height: 48);
     }
 
     return NotificationListener<UserScrollNotification>(
@@ -522,19 +524,54 @@ class _AccordionHeaderChip extends StatelessWidget {
       // count badge inside the label instead, dropping the avatar slot.
       return wrapLongPress(
         FilterChip(
-        labelPadding: EdgeInsets.zero,
+          labelPadding: EdgeInsets.zero,
-        label: Column(
+          label: Column(
-          mainAxisSize: MainAxisSize.min,
+            mainAxisSize: MainAxisSize.min,
-          children: [
+            children: [
-            if (iconAvatar != null) iconAvatar,
+              if (iconAvatar != null) iconAvatar,
-            if (countBadge != null) ...[
+              if (countBadge != null) ...[
-              if (iconAvatar != null) const SizedBox(height: 4),
+                if (iconAvatar != null) const SizedBox(height: 4),
-              // Multi-digit counts can exceed the narrow rail's fixed 48px chip
+                // Multi-digit counts can exceed the narrow rail's fixed 48px chip
-              // width; scale the badge down to fit instead of overflowing.
+                // width; scale the badge down to fit instead of overflowing.
-              FittedBox(fit: BoxFit.scaleDown, child: countBadge),
+                FittedBox(fit: BoxFit.scaleDown, child: countBadge),
+              ],
             ],
-          ],
+          ),
+          color: WidgetStatePropertyAll(fill),
+          selected: false,
+          showCheckmark: false,
+          onSelected: (value) {
+            if (value) {
+              onSelected();
+            }
+          },
+          side: side,
+          shape: shape,
         ),
+      );
+    }
+
+    return wrapLongPress(
+      FilterChip(
+        avatar: iconAvatar,
+        label: container != null
+            ? buildContainerChipLabel(
+                context,
+                container,
+                true,
+                trailing: countBadge,
+              )
+            : SizedBox(
+                height: 20,
+                child: Center(
+                  child:
+                      countBadge ??
+                      DefaultTextStyle.merge(
+                        style: TextStyle(color: nullForeground),
+                        child: const SizedBox.shrink(),
+                      ),
+                ),
+              ),
         color: WidgetStatePropertyAll(fill),
         selected: false,
         showCheckmark: false,
@@ -545,41 +582,6 @@ class _AccordionHeaderChip extends StatelessWidget {
         },
         side: side,
         shape: shape,
-        ),
-      );
-    }
-
-    return wrapLongPress(
-      FilterChip(
-      avatar: iconAvatar,
-      label: container != null
-          ? buildContainerChipLabel(
-              context,
-              container,
-              true,
-              trailing: countBadge,
-            )
-          : SizedBox(
-              height: 20,
-              child: Center(
-                child:
-                    countBadge ??
-                    DefaultTextStyle.merge(
-                      style: TextStyle(color: nullForeground),
-                      child: const SizedBox.shrink(),
-                    ),
-              ),
-            ),
-      color: WidgetStatePropertyAll(fill),
-      selected: false,
-      showCheckmark: false,
-      onSelected: (value) {
-        if (value) {
-          onSelected();
-        }
-      },
-      side: side,
-      shape: shape,
       ),
     );
   }

apps/weblibre/lib/features/geckoview/features/contextmenu/presentation/candidates/open_new_tab.dart

@@ -82,12 +82,11 @@ class OpenInNewTab extends HookConsumerWidget {
 
     // Alternative tab types the user can explicitly choose, excluding the type
     // that the main tile action already opens (the current tab's type).
-    final alternativeTypes =
+    final alternativeTypes = <TabType>[
-        <TabType>[
+      TabType.regular,
-          TabType.regular,
+      TabType.private,
-          TabType.private,
+      if (settings.showIsolatedTabUi) TabType.isolated,
-          if (settings.showIsolatedTabUi) TabType.isolated,
+    ]..remove(currentTabMode.toTabType());
-        ]..remove(currentTabMode.toTabType());
 
     return ListTile(
       leading: const Icon(MdiIcons.tabPlus),

apps/weblibre/lib/features/geckoview/features/history/domain/services/visit_container_recorder.dart

@@ -90,7 +90,9 @@ class VisitContainerRecorder extends _$VisitContainerRecorder {
       // permanently. A genuine miss (deleted container) leaves the cache
       // non-empty, so this fallback does not fire repeatedly in steady state.
       if (containerId == null && contextIdToContainerId.isEmpty) {
-        applyContainers(await ref.read(watchContainersWithCountProvider.future));
+        applyContainers(
+          await ref.read(watchContainersWithCountProvider.future),
+        );
         containerId = contextIdToContainerId[contextId];
       }
 

apps/weblibre/lib/features/geckoview/features/tabs/data/database/daos/visit_container.dart

@@ -75,9 +75,9 @@ class VisitContainerDao extends DatabaseAccessor<TabDatabase>
         start,
         math.min(start + chunkSize, canonicalList.length),
       );
-      final rows = await (db.select(db.visitContainer)
+      final rows = await (db.select(
-            ..where((t) => t.urlCanonical.isIn(chunk)))
+        db.visitContainer,
-          .get();
+      )..where((t) => t.urlCanonical.isIn(chunk))).get();
       results.addAll(rows);
     }
     return results;
@@ -103,9 +103,9 @@ class VisitContainerDao extends DatabaseAccessor<TabDatabase>
   /// Container deletion dissolves relations automatically via ON DELETE CASCADE
   /// and does not go through here.
   Future<int> deleteForContainer(String containerId) {
-    return (db.delete(db.visitContainer)
+    return (db.delete(
-          ..where((t) => t.containerId.equals(containerId)))
+      db.visitContainer,
-        .go();
+    )..where((t) => t.containerId.equals(containerId))).go();
   }
 
   /// Remove every relation row, all containers. Used when the user clears all

apps/weblibre/lib/features/geckoview/features/tabs/presentation/screens/container_edit.dart

@@ -62,7 +62,8 @@ Future<void> _removeAppLinkOverrides(
   ) {
     if (!ids.any(current.appLinkContextOverrides.containsKey)) return current;
     return current.copyWith.appLinkContextOverrides(
-      {...current.appLinkContextOverrides}..removeWhere((key, _) => ids.contains(key)),
+      {...current.appLinkContextOverrides}
+        ..removeWhere((key, _) => ids.contains(key)),
     );
   });
 }

apps/weblibre/lib/features/gestures/domain/services/gesture_control.dart

@@ -34,7 +34,6 @@ import 'package:weblibre/features/geckoview/domain/providers/tab_session.dart';
 import 'package:weblibre/features/geckoview/domain/providers/tab_state.dart';
 import 'package:weblibre/features/geckoview/domain/repositories/tab.dart';
 import 'package:weblibre/features/geckoview/features/bookmarks/domain/repositories/bookmarks.dart';
-import 'package:weblibre/features/geckoview/features/bookmarks/domain/utils/bookmark_tree_utils.dart';
 import 'package:weblibre/features/geckoview/features/browser/domain/entities/font_size_constants.dart';
 import 'package:weblibre/features/geckoview/features/browser/presentation/widgets/translation_bottom_sheet.dart';
 import 'package:weblibre/features/geckoview/features/find_in_page/presentation/controllers/find_in_page.dart';
@@ -229,10 +228,8 @@ class GestureControlService extends _$GestureControlService {
     final bookmarkUrl =
         ref.read(sandboxSourceUriForTabProvider(tabId: tabId)) ?? tabState.url;
 
-    final bookmarks = ref.read(bookmarksRepositoryProvider).value;
-    final existingGuids = bookmarkGuidsForUrl(bookmarks, bookmarkUrl);
-
     final repository = ref.read(bookmarksRepositoryProvider.notifier);
+    final existingGuids = await repository.bookmarkGuidsForUrl(bookmarkUrl);
     if (existingGuids.isNotEmpty) {
       for (final guid in existingGuids) {
         await repository.delete(guid);

apps/weblibre/lib/features/gestures/domain/services/gesture_control.g.dart

@@ -66,7 +66,7 @@ final class GestureControlServiceProvider
 }
 
 String _$gestureControlServiceHash() =>
-    r'12bd852a5b90b67bee4a94e7bd55fccc53c11bd4';
+    r'3741c0a3d9cb6726c044bab1efd4ce80208f21d8';
 
 /// Bridges gesture settings and recognized-gesture events to app actions.
 ///

apps/weblibre/lib/features/settings/presentation/screens/browsing_settings.dart

@@ -781,8 +781,8 @@ class _AppLinksModeSection extends HookConsumerWidget {
                     await ref
                         .read(saveGeneralSettingsControllerProvider.notifier)
                         .save(
-                          (current) =>
+                          (current) => current.copyWith
-                              current.copyWith.appLinkMarketplaceFallback(value),
+                              .appLinkMarketplaceFallback(value),
                         );
                   },
           ),
@@ -845,9 +845,9 @@ class _AppLinkRulesSubsection extends ConsumerWidget {
                 await ref
                     .read(saveGeneralSettingsControllerProvider.notifier)
                     .save(
-                      (current) => current.copyWith.appLinkRules({
+                      (current) => current.copyWith.appLinkRules(
-                        ...current.appLinkRules,
+                        {...current.appLinkRules}..remove(key),
-                      }..remove(key)),
+                      ),
                     );
               },
             ),

apps/weblibre/lib/features/small_web/presentation/widgets/small_web_bottom_bar.dart

@@ -19,13 +19,12 @@
  */
 import 'dart:math';
 
-import 'package:fast_equatable/fast_equatable.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_hooks/flutter_hooks.dart';
 import 'package:flutter_mozilla_components/flutter_mozilla_components.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:weblibre/features/geckoview/features/bookmarks/domain/providers/bookmarks.dart';
 import 'package:weblibre/features/geckoview/features/bookmarks/domain/repositories/bookmarks.dart';
-import 'package:weblibre/features/geckoview/features/bookmarks/domain/utils/bookmark_tree_utils.dart';
 import 'package:weblibre/utils/ui_helper.dart' as ui_helper;
 
 // What words does the wanderer whisper?
@@ -173,18 +172,16 @@ class SmallWebBottomBar extends HookConsumerWidget {
 
     final tabUrl = currentTabUrl;
     final bookmarkable = tabUrl != null;
-    final existingGuids = ref
+    // Answered by a storage lookup keyed on the URL, so this does not depend on
-        .watch(
+    // the whole bookmark tree being resident in memory.
-          bookmarksRepositoryProvider.select(
+    final bookmarkLookup = ref.watch(
-            (async) => EquatableValue(
+      bookmarkGuidsForUrlProvider(bookmarkable ? tabUrl : null),
-              bookmarkable
+    );
-                  ? bookmarkGuidsForUrl(async.value, tabUrl)
+    final existingGuids = bookmarkLookup.value ?? const <String>[];
-                  : const <String>[],
-            ),
-          ),
-        )
-        .value;
 
+    // Until the lookup settles an existing bookmark is indistinguishable from
+    // none, and assuming none would let a quick tap add a second copy.
+    final canToggleBookmark = bookmarkable && bookmarkLookup.hasValue;
     final isBookmarked = existingGuids.isNotEmpty;
 
     return SizedBox(
@@ -224,7 +221,7 @@ class SmallWebBottomBar extends HookConsumerWidget {
           IconButton(
             icon: Icon(isBookmarked ? Icons.bookmark : Icons.bookmark_border),
             tooltip: isBookmarked ? 'Remove bookmark' : 'Add bookmark',
-            onPressed: !bookmarkable
+            onPressed: !canToggleBookmark
                 ? null
                 : () async {
                     if (isBookmarked) {

apps/weblibre/pubspec.yaml

@@ -8,7 +8,6 @@ environment:
   sdk: '>=3.8.0 <4.0.0'
 
 dependencies:
-  animated_tree_view: ^2.3.0
   background_fetch: ^1.7.0
   collection: ^1.19.1
   convert: ^3.1.2

apps/weblibre/test/features/app_links/app_link_prompt_rules_test.dart

@@ -86,7 +86,9 @@ void main() {
 
     test('is producible even for an ambiguous resolution', () {
       // neverOpen never launches, so it does not need a bound package.
-      final rule = neverOpenRuleFor(_target(isAmbiguous: true, packageName: null));
+      final rule = neverOpenRuleFor(
+        _target(isAmbiguous: true, packageName: null),
+      );
       expect(rule.decision, AppLinkRuleDecision.neverOpen);
       expect(rule.isValid, isTrue);
     });

apps/weblibre/test/features/app_links/app_link_rule_test.dart

@@ -80,15 +80,15 @@ void main() {
         },
       });
       expect(parsed.length, 2);
-      expect(parsed['host:youtube.com']!.decision, AppLinkRuleDecision.alwaysOpen);
+      expect(
+        parsed['host:youtube.com']!.decision,
+        AppLinkRuleDecision.alwaysOpen,
+      );
     });
 
     test('drops entries whose map key disagrees with the rule scope', () {
       final parsed = parseAppLinkRules({
-        'host:wrong.com': {
+        'host:wrong.com': {'decision': 'neverOpen', 'scope': 'host:right.com'},
-          'decision': 'neverOpen',
-          'scope': 'host:right.com',
-        },
       });
       expect(parsed, isEmpty);
     });

apps/weblibre/test/features/app_links/effective_routing_test.dart

@@ -23,11 +23,8 @@ import 'package:weblibre/features/app_links/domain/services/effective_routing.da
 import 'package:weblibre/features/geckoview/features/tabs/data/models/site_assignment.dart';
 import 'package:weblibre/features/proxy/data/proxy_connection.dart';
 
-SiteAssignment _assignment(String site, {String? contextId}) => SiteAssignment(
+SiteAssignment _assignment(String site, {String? contextId}) =>
-  id: site,
+    SiteAssignment(id: site, contextualIdentity: contextId, assignedSite: site);
-  contextualIdentity: contextId,
-  assignedSite: site,
-);
 
 void main() {
   group('resolveContainerAssignment', () {

apps/weblibre/test/features/geckoview/features/bookmarks/domain/utils/bookmark_tree_utils_test.dart

@@ -0,0 +1,242 @@
+/*
+ * Copyright (c) 2024-2026 Fabian Freund.
+ *
+ * This file is part of WebLibre
+ * (see https://weblibre.eu).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import 'package:flutter_mozilla_components/flutter_mozilla_components.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:weblibre/features/geckoview/features/bookmarks/domain/entities/bookmark_item.dart';
+import 'package:weblibre/features/geckoview/features/bookmarks/domain/entities/bookmark_sort_type.dart';
+import 'package:weblibre/features/geckoview/features/bookmarks/domain/utils/bookmark_tree_utils.dart';
+
+BookmarkEntry entry(String guid, String title) => BookmarkEntry(
+  guid: guid,
+  parentGuid: BookmarkRoot.menu.id,
+  url: Uri.parse('https://example.com/$guid'),
+  title: title,
+  previewImageUrl: Uri.parse('https://example.com/$guid'),
+  position: 0,
+  dateAdded: 0,
+);
+
+BookmarkFolder folder(String guid, String title, {List<BookmarkItem>? kids}) =>
+    BookmarkFolder(
+      guid: guid,
+      parentGuid: BookmarkRoot.root.id,
+      title: title,
+      position: 0,
+      dateAdded: 0,
+      children: kids,
+    );
+
+void main() {
+  group('sortBookmarkChildren', () {
+    test('should leave order untouched for manual sorting', () {
+      final children = [entry('b', 'Beta'), entry('a', 'Alpha')];
+
+      final sorted = sortBookmarkChildren(children, BookmarkSortType.manual);
+
+      expect(sorted.map((c) => c.guid), equals(['b', 'a']));
+    });
+
+    test('should sort a plain level by title', () {
+      final children = [
+        entry('c', 'Charlie'),
+        entry('a', 'Alpha'),
+        entry('b', 'Bravo'),
+      ];
+
+      final sorted = sortBookmarkChildren(children, BookmarkSortType.titleAsc);
+
+      expect(sorted.map((c) => c.title), equals(['Alpha', 'Bravo', 'Charlie']));
+    });
+
+    test('should not mutate the list it was given', () {
+      final children = [entry('c', 'Charlie'), entry('a', 'Alpha')];
+
+      sortBookmarkChildren(children, BookmarkSortType.titleAsc);
+
+      expect(children.map((c) => c.guid), equals(['c', 'a']));
+    });
+
+    test('should keep built-in roots pinned ahead of the rest at root', () {
+      final children = <BookmarkItem>[
+        entry('z', 'Zulu'),
+        folder(BookmarkRoot.mobile.id, 'WebLibre'),
+        entry('a', 'Alpha'),
+        folder(BookmarkRoot.menu.id, 'Menu'),
+      ];
+
+      final sorted = sortBookmarkChildren(
+        children,
+        BookmarkSortType.titleAsc,
+        isRoot: true,
+      );
+
+      expect(
+        sorted.map((c) => c.guid),
+        equals([BookmarkRoot.mobile.id, BookmarkRoot.menu.id, 'a', 'z']),
+      );
+    });
+  });
+
+  group('resolveSelectedItems', () {
+    test('should return the children whose guids are selected', () {
+      final children = [entry('a', 'Alpha'), entry('b', 'Bravo')];
+
+      final selected = resolveSelectedItems(children, {'b'});
+
+      expect(selected.single.guid, equals('b'));
+    });
+
+    test('should ignore guids that are not in the given list', () {
+      final children = [entry('a', 'Alpha')];
+
+      expect(resolveSelectedItems(children, {'somewhere-else'}), isEmpty);
+    });
+
+    test('should resolve items that live in other folders', () {
+      // Search results come from anywhere in the library, so the list handed to
+      // this function is not always one folder's children. Callers must pass
+      // whatever is actually on screen — resolving against the current folder
+      // instead would silently drop every result from a subfolder.
+      final results = [
+        entry('a', 'Alpha').copyWith(parentGuid: 'folder_one__'),
+        entry('b', 'Bravo').copyWith(parentGuid: 'folder_two__'),
+      ];
+
+      final selected = resolveSelectedItems(results, {'a', 'b'});
+
+      expect(selected.map((item) => item.guid), equals(['a', 'b']));
+    });
+  });
+
+  group('normalizeSelection', () {
+    test('should keep selections that are siblings', () {
+      final rows = [
+        BookmarkRow(entry('a', 'Alpha'), 0),
+        BookmarkRow(entry('b', 'Bravo'), 0),
+      ];
+
+      expect(normalizeSelection(rows, {'a', 'b'}), equals({'a', 'b'}));
+    });
+
+    test('should drop children of a selected folder', () {
+      final rows = [
+        BookmarkRow(folder('f1__________', 'Folder'), 0),
+        BookmarkRow(entry('child_______', 'Child'), 1),
+        BookmarkRow(entry('after_______', 'After'), 0),
+      ];
+
+      final normalized = normalizeSelection(rows, {
+        'f1__________',
+        'child_______',
+        'after_______',
+      });
+
+      expect(normalized, equals({'f1__________', 'after_______'}));
+    });
+
+    test('should drop the whole subtree under a selected folder', () {
+      final rows = [
+        BookmarkRow(folder('outer_______', 'Outer'), 0),
+        BookmarkRow(folder('inner_______', 'Inner'), 1),
+        BookmarkRow(entry('deep________', 'Deep'), 2),
+        BookmarkRow(entry('sibling_____', 'Sibling'), 0),
+      ];
+
+      final normalized = normalizeSelection(rows, {
+        'outer_______',
+        'inner_______',
+        'deep________',
+        'sibling_____',
+      });
+
+      expect(normalized, equals({'outer_______', 'sibling_____'}));
+    });
+
+    test('should keep a nested selection when its parent is not selected', () {
+      final rows = [
+        BookmarkRow(folder('f1__________', 'Folder'), 0),
+        BookmarkRow(entry('child_______', 'Child'), 1),
+      ];
+
+      expect(
+        normalizeSelection(rows, {'child_______'}),
+        equals({'child_______'}),
+      );
+    });
+
+    test('should not count a loading placeholder as a second occurrence', () {
+      // While an expanded folder loads, a placeholder row repeats it one level
+      // down. Treating that as a real row would resolve the folder twice and
+      // apply the same move or delete to it twice over.
+      final selectedFolder = folder('f1__________', 'Folder');
+      final rows = [
+        BookmarkRow(selectedFolder, 0),
+        BookmarkRow(selectedFolder, 1, isPlaceholder: true),
+      ];
+
+      final normalized = normalizeSelection(rows, {'f1__________'});
+
+      expect(normalized, equals({'f1__________'}));
+    });
+
+    test('should resume after leaving a selected folder subtree', () {
+      final rows = [
+        BookmarkRow(folder('f1__________', 'One'), 0),
+        BookmarkRow(entry('inside______', 'Inside'), 1),
+        BookmarkRow(folder('f2__________', 'Two'), 0),
+        BookmarkRow(entry('later_______', 'Later'), 1),
+      ];
+
+      final normalized = normalizeSelection(rows, {
+        'f1__________',
+        'inside______',
+        'later_______',
+      });
+
+      expect(normalized, equals({'f1__________', 'later_______'}));
+    });
+  });
+
+  group('canFlattenFolder', () {
+    test('should reject built-in roots', () {
+      expect(canFlattenFolder(folder(BookmarkRoot.menu.id, 'Menu')), isFalse);
+    });
+
+    test('should accept an ordinary folder even before its children load', () {
+      // The list only loads one level, so a folder shown in it has no children
+      // attached; emptiness is decided by the repository at operation time.
+      expect(canFlattenFolder(folder('normal______', 'Normal')), isTrue);
+    });
+
+    test('should reject a folder without a parent', () {
+      final orphan = BookmarkFolder(
+        guid: 'orphan______',
+        parentGuid: null,
+        title: 'Orphan',
+        position: 0,
+        dateAdded: 0,
+        children: null,
+      );
+
+      expect(canFlattenFolder(orphan), isFalse);
+    });
+  });
+}

apps/weblibre/test/features/geckoview/features/bookmarks/utils/bookmark_html_utils_test.dart

@@ -24,11 +24,26 @@ import 'package:flutter_mozilla_components/flutter_mozilla_components.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:mockito/annotations.dart';
 import 'package:mockito/mockito.dart';
+import 'package:weblibre/features/geckoview/features/bookmarks/domain/entities/import_bookmark_node.dart';
 import 'package:weblibre/features/geckoview/features/bookmarks/utils/bookmark_html_utils.dart';
 
 @GenerateMocks([GeckoBookmarksService])
 import 'bookmark_html_utils_test.mocks.dart';
 
+/// Nodes the parser routed to [root], or an empty list if it produced no such
+/// section.
+List<ImportBookmarkNode> section(ImportBookmarkTree tree, BookmarkRoot root) =>
+    tree.sections[root.id] ?? const [];
+
+/// Mirrors what the native side reports back: bookmark items only, recursively.
+int countItems(List<BookmarkImportNode> nodes) => nodes.fold(
+  0,
+  (total, node) =>
+      total +
+      (node.type == BookmarkNodeType.item ? 1 : 0) +
+      countItems(node.children),
+);
+
 void main() {
   late MockGeckoBookmarksService mockService;
   late BookmarkHTMLUtils utils;
@@ -36,72 +51,20 @@ void main() {
   setUp(() {
     mockService = MockGeckoBookmarksService();
     utils = BookmarkHTMLUtils(mockService);
+
+    when(mockService.eraseEverything(any)).thenAnswer((_) async {});
+    when(mockService.insertTree(any, any)).thenAnswer(
+      (invocation) async => BookmarkInsertTreeResult(
+        insertedItemCount: countItems(
+          invocation.positionalArguments[1] as List<BookmarkImportNode>,
+        ),
+        failedNodeCount: 0,
+      ),
+    );
   });
 
-  group('BookmarkHTMLUtils - Import', () {
+  group('parseBookmarkHtml', () {
-    test('should handle corrupt HTML file with malformed URIs', () async {
+    test('should route everything under menu without root markers', () {
-      // Load the corrupt fixture
-      final fixtureFile = File(
-        'test/utils/bookmarks/fixtures/bookmarks.corrupt.html',
-      );
-      final htmlString = await fixtureFile.readAsString();
-
-      // Mock the service calls
-      when(mockService.eraseEverything(any)).thenAnswer((_) async {});
-      when(
-        mockService.addFolder(any, any, any),
-      ).thenAnswer((_) async => 'generated_guid');
-      when(
-        mockService.addItem(any, any, any, any),
-      ).thenAnswer((_) async => 'generated_guid');
-
-      final count = await utils.importFromHTML(htmlString, replace: true);
-
-      // Should import valid bookmarks and skip the corrupt one
-      expect(count, greaterThan(0));
-      verify(mockService.eraseEverything(BookmarkRoot.root)).called(1);
-    });
-
-    test('should import from valid HTML file', () async {
-      final fixtureFile = File(
-        'test/utils/bookmarks/fixtures/bookmarks.preplaces.html',
-      );
-      final htmlString = await fixtureFile.readAsString();
-
-      when(mockService.eraseEverything(any)).thenAnswer((_) async {});
-      when(
-        mockService.addFolder(any, any, any),
-      ).thenAnswer((_) async => 'folder_guid');
-      when(
-        mockService.addItem(any, any, any, any),
-      ).thenAnswer((_) async => 'bookmark_guid');
-
-      final count = await utils.importFromHTML(htmlString, replace: true);
-
-      expect(count, greaterThan(0));
-      verify(mockService.eraseEverything(BookmarkRoot.root)).called(1);
-      // Verify some bookmarks were added
-      verify(mockService.addItem(any, any, any, any)).called(greaterThan(0));
-    });
-
-    test('should handle empty HTML', () async {
-      const emptyHtml = '''
-        <!DOCTYPE NETSCAPE-Bookmark-file-1>
-        <TITLE>Bookmarks</TITLE>
-        <H1>Bookmarks</H1>
-        <DL><p>
-        </DL>
-      ''';
-
-      when(mockService.eraseEverything(any)).thenAnswer((_) async {});
-
-      final count = await utils.importFromHTML(emptyHtml, replace: true);
-
-      expect(count, equals(0));
-      verify(mockService.eraseEverything(BookmarkRoot.root)).called(1);
-    });
-
-    test('should not erase when replace is false', () async {
       const simpleHtml = '''
         <!DOCTYPE NETSCAPE-Bookmark-file-1>
         <TITLE>Bookmarks</TITLE>
@@ -111,16 +74,19 @@ void main() {
         </DL>
       ''';
 
-      when(
+      final tree = parseBookmarkHtml(simpleHtml, preserveRootFolders: false);
-        mockService.addItem(any, any, any, any),
-      ).thenAnswer((_) async => 'guid');
 
-      await utils.importFromHTML(simpleHtml);
+      expect(tree.sections.keys, equals([BookmarkRoot.menu.id]));
-
+      expect(
-      verifyNever(mockService.eraseEverything(any));
+        section(tree, BookmarkRoot.menu).single,
+        isA<ImportBookmarkItem>()
+            .having((i) => i.url, 'url', Uri.parse('https://example.com'))
+            .having((i) => i.title, 'title', 'Example'),
+      );
+      expect(tree.stats.bookmarkCount, equals(1));
     });
 
-    test('should handle bookmarks with special characters in title', () async {
+    test('should decode HTML entities in titles', () {
       const htmlWithSpecialChars = '''
         <!DOCTYPE NETSCAPE-Bookmark-file-1>
         <TITLE>Bookmarks</TITLE>
@@ -130,21 +96,16 @@ void main() {
         </DL>
       ''';
 
-      when(
+      final tree = parseBookmarkHtml(
-        mockService.addItem(any, any, any, any),
+        htmlWithSpecialChars,
-      ).thenAnswer((_) async => 'guid');
+        preserveRootFolders: false,
+      );
 
-      final count = await utils.importFromHTML(htmlWithSpecialChars);
+      final item = section(tree, BookmarkRoot.menu).single;
-
+      expect((item as ImportBookmarkItem).title, equals('<unescaped="test">'));
-      expect(count, equals(1));
-      final captured = verify(
-        mockService.addItem(any, any, captureAny, any),
-      ).captured;
-      // Should properly decode HTML entities
-      expect(captured[0], equals('<unescaped="test">'));
     });
 
-    test('should import bookmarks with timestamps', () async {
+    test('should preserve item timestamps as seconds since epoch', () {
       const htmlWithDates = '''
         <!DOCTYPE NETSCAPE-Bookmark-file-1>
         <TITLE>Bookmarks</TITLE>
@@ -154,16 +115,63 @@ void main() {
         </DL>
       ''';
 
-      when(
+      final tree = parseBookmarkHtml(htmlWithDates, preserveRootFolders: false);
-        mockService.addItem(any, any, any, any),
-      ).thenAnswer((_) async => 'guid');
 
-      final count = await utils.importFromHTML(htmlWithDates);
+      final item =
-
+          section(tree, BookmarkRoot.menu).single as ImportBookmarkItem;
-      expect(count, equals(1));
+      expect(
+        item.dateAdded,
+        equals(DateTime.fromMillisecondsSinceEpoch(1177375336 * 1000)),
+      );
+      expect(
+        item.lastModified,
+        equals(DateTime.fromMillisecondsSinceEpoch(1177375423 * 1000)),
+      );
     });
 
-    test('should handle folder hierarchy', () async {
+    test('should fall back to LAST_MODIFIED when ADD_DATE is absent', () {
+      const html = '''
+        <!DOCTYPE NETSCAPE-Bookmark-file-1>
+        <H1>Bookmarks</H1>
+        <DL><p>
+          <DT><A HREF="https://example.com" LAST_MODIFIED="1177375423">Test</A>
+        </DL>
+      ''';
+
+      final tree = parseBookmarkHtml(html, preserveRootFolders: false);
+
+      final item =
+          section(tree, BookmarkRoot.menu).single as ImportBookmarkItem;
+      expect(item.dateAdded, equals(item.lastModified));
+    });
+
+    test('should preserve folder timestamps', () {
+      const html = '''
+        <!DOCTYPE NETSCAPE-Bookmark-file-1>
+        <H1>Bookmarks</H1>
+        <DL><p>
+          <DT><H3 ADD_DATE="1177375336" LAST_MODIFIED="1177375423">Dated</H3>
+          <DL><p>
+            <DT><A HREF="https://example.com">Child</A>
+          </DL><p>
+        </DL>
+      ''';
+
+      final tree = parseBookmarkHtml(html, preserveRootFolders: false);
+
+      final folder =
+          section(tree, BookmarkRoot.menu).single as ImportBookmarkFolder;
+      expect(
+        folder.dateAdded,
+        equals(DateTime.fromMillisecondsSinceEpoch(1177375336 * 1000)),
+      );
+      expect(
+        folder.lastModified,
+        equals(DateTime.fromMillisecondsSinceEpoch(1177375423 * 1000)),
+      );
+    });
+
+    test('should nest folders and keep child order', () {
       const htmlWithFolders = '''
         <!DOCTYPE NETSCAPE-Bookmark-file-1>
         <TITLE>Bookmarks</TITLE>
@@ -180,24 +188,98 @@ void main() {
         </DL>
       ''';
 
-      when(
+      final tree = parseBookmarkHtml(
-        mockService.addFolder(any, any, any),
+        htmlWithFolders,
-      ).thenAnswer((_) async => 'folder_guid');
+        preserveRootFolders: false,
-      when(
+      );
-        mockService.addItem(any, any, any, any),
-      ).thenAnswer((_) async => 'bookmark_guid');
 
-      final count = await utils.importFromHTML(htmlWithFolders);
+      final parent =
+          section(tree, BookmarkRoot.menu).single as ImportBookmarkFolder;
+      expect(parent.title, equals('Parent Folder'));
+      expect(parent.children, hasLength(2));
 
-      expect(count, equals(2)); // 2 bookmarks
+      expect(
-      verify(mockService.addFolder(any, any, any)).called(2); // 2 folders
+        (parent.children[0] as ImportBookmarkItem).title,
+        equals('Child 1'),
+      );
+
+      final nested = parent.children[1] as ImportBookmarkFolder;
+      expect(nested.title, equals('Nested Folder'));
+      expect(
+        (nested.children.single as ImportBookmarkItem).title,
+        equals('Grandchild'),
+      );
+
+      expect(tree.stats.bookmarkCount, equals(2));
+      expect(tree.stats.folderCount, equals(2));
     });
 
-    test('should recognize toolbar folder', () async {
+    test('should keep empty folders', () {
-      const htmlWithToolbar = '''
+      const html = '''
+        <!DOCTYPE NETSCAPE-Bookmark-file-1>
+        <H1>Bookmarks</H1>
+        <DL><p>
+          <DT><H3>Empty</H3>
+          <DL><p>
+          </DL><p>
+          <DT><A HREF="https://example.com">After</A>
+        </DL>
+      ''';
+
+      final tree = parseBookmarkHtml(html, preserveRootFolders: false);
+      final nodes = section(tree, BookmarkRoot.menu);
+
+      expect(nodes, hasLength(2));
+      expect(
+        nodes[0],
+        isA<ImportBookmarkFolder>()
+            .having((f) => f.title, 'title', 'Empty')
+            .having((f) => f.children, 'children', isEmpty),
+      );
+      expect(nodes[1], isA<ImportBookmarkItem>());
+    });
+
+    test('should route root-marked folders when preserving roots', () {
+      const htmlWithRoots = '''
         <!DOCTYPE NETSCAPE-Bookmark-file-1>
         <TITLE>Bookmarks</TITLE>
         <H1>Bookmarks</H1>
+        <DL><p>
+          <DT><H3 PERSONAL_TOOLBAR_FOLDER="true">Bookmarks Toolbar</H3>
+          <DL><p>
+            <DT><A HREF="https://example.com/toolbar">Toolbar Bookmark</A>
+          </DL><p>
+          <DT><H3 UNFILED_BOOKMARKS_FOLDER="true">Unsorted Bookmarks</H3>
+          <DL><p>
+            <DT><A HREF="https://example.com/unfiled">Unfiled Bookmark</A>
+          </DL><p>
+          <DT><A HREF="https://example.com/loose">Loose</A>
+        </DL>
+      ''';
+
+      final tree = parseBookmarkHtml(htmlWithRoots, preserveRootFolders: true);
+
+      expect(
+        (section(tree, BookmarkRoot.toolbar).single as ImportBookmarkItem)
+            .title,
+        equals('Toolbar Bookmark'),
+      );
+      expect(
+        (section(tree, BookmarkRoot.unfiled).single as ImportBookmarkItem)
+            .title,
+        equals('Unfiled Bookmark'),
+      );
+      // The marked folders themselves are not recreated, only their contents.
+      expect(
+        (section(tree, BookmarkRoot.menu).single as ImportBookmarkItem).title,
+        equals('Loose'),
+      );
+    });
+
+    test('should treat root markers as plain folders when not preserving', () {
+      const htmlWithToolbar = '''
+        <!DOCTYPE NETSCAPE-Bookmark-file-1>
+        <H1>Bookmarks</H1>
         <DL><p>
           <DT><H3 PERSONAL_TOOLBAR_FOLDER="true">Bookmarks Toolbar</H3>
           <DL><p>
@@ -206,47 +288,19 @@ void main() {
         </DL>
       ''';
 
-      when(mockService.eraseEverything(any)).thenAnswer((_) async {});
+      final tree = parseBookmarkHtml(
-      when(
+        htmlWithToolbar,
-        mockService.addItem(any, any, any, any),
+        preserveRootFolders: false,
-      ).thenAnswer((_) async => 'guid');
+      );
 
-      await utils.importFromHTML(htmlWithToolbar, replace: true);
+      expect(tree.sections.keys, equals([BookmarkRoot.menu.id]));
-
+      expect(
-      // When replace is true, should add to toolbar
+        (section(tree, BookmarkRoot.menu).single as ImportBookmarkFolder).title,
-      final captured = verify(
+        equals('Bookmarks Toolbar'),
-        mockService.addItem(captureAny, any, any, any),
+      );
-      ).captured;
-      expect(captured[0], equals(BookmarkRoot.toolbar.id));
     });
 
-    test('should recognize unfiled folder', () async {
+    test('should keep separators between bookmarks', () {
-      const htmlWithUnfiled = '''
-        <!DOCTYPE NETSCAPE-Bookmark-file-1>
-        <TITLE>Bookmarks</TITLE>
-        <H1>Bookmarks</H1>
-        <DL><p>
-          <DT><H3 UNFILED_BOOKMARKS_FOLDER="true">Unsorted Bookmarks</H3>
-          <DL><p>
-            <DT><A HREF="https://example.com">Unfiled Bookmark</A>
-          </DL><p>
-        </DL>
-      ''';
-
-      when(mockService.eraseEverything(any)).thenAnswer((_) async {});
-      when(
-        mockService.addItem(any, any, any, any),
-      ).thenAnswer((_) async => 'guid');
-
-      await utils.importFromHTML(htmlWithUnfiled, replace: true);
-
-      final captured = verify(
-        mockService.addItem(captureAny, any, any, any),
-      ).captured;
-      expect(captured[0], equals(BookmarkRoot.unfiled.id));
-    });
-
-    test('should handle separators', () async {
       const htmlWithSeparator = '''
         <!DOCTYPE NETSCAPE-Bookmark-file-1>
         <TITLE>Bookmarks</TITLE>
@@ -258,17 +312,19 @@ void main() {
         </DL>
       ''';
 
-      when(
+      final tree = parseBookmarkHtml(
-        mockService.addItem(any, any, any, any),
+        htmlWithSeparator,
-      ).thenAnswer((_) async => 'guid');
+        preserveRootFolders: false,
+      );
+      final nodes = section(tree, BookmarkRoot.menu);
 
-      final count = await utils.importFromHTML(htmlWithSeparator);
+      expect(nodes, hasLength(3));
-
+      expect(nodes[1], isA<ImportBookmarkSeparator>());
-      // Should import 2 bookmarks (separator is not supported by Android API)
+      expect(tree.stats.bookmarkCount, equals(2));
-      expect(count, equals(2));
+      expect(tree.stats.separatorCount, equals(1));
     });
 
-    test('should skip bookmarks without URLs', () async {
+    test('should skip bookmarks without URLs', () {
       const htmlWithoutUrl = '''
         <!DOCTYPE NETSCAPE-Bookmark-file-1>
         <TITLE>Bookmarks</TITLE>
@@ -279,16 +335,16 @@ void main() {
         </DL>
       ''';
 
-      when(
+      final tree = parseBookmarkHtml(
-        mockService.addItem(any, any, any, any),
+        htmlWithoutUrl,
-      ).thenAnswer((_) async => 'guid');
+        preserveRootFolders: false,
+      );
 
-      final count = await utils.importFromHTML(htmlWithoutUrl);
+      expect(section(tree, BookmarkRoot.menu), hasLength(1));
-
+      expect(tree.stats.skippedUrlCount, equals(1));
-      expect(count, equals(1)); // Only the valid one
     });
 
-    test('should skip bookmarks with invalid URLs', () async {
+    test('should skip bookmarks with schemeless URLs', () {
       const htmlWithInvalidUrl = '''
         <!DOCTYPE NETSCAPE-Bookmark-file-1>
         <TITLE>Bookmarks</TITLE>
@@ -299,31 +355,209 @@ void main() {
         </DL>
       ''';
 
-      when(
+      final tree = parseBookmarkHtml(
-        mockService.addItem(any, any, any, any),
+        htmlWithInvalidUrl,
-      ).thenAnswer((_) async => 'guid');
+        preserveRootFolders: false,
+      );
 
-      final count = await utils.importFromHTML(htmlWithInvalidUrl);
+      expect(section(tree, BookmarkRoot.menu), hasLength(1));
-
+      expect(tree.stats.skippedUrlCount, equals(1));
-      expect(count, equals(1));
     });
 
-    test('should handle single frame HTML', () async {
+    test('should produce no sections for an empty document', () {
-      final fixtureFile = File(
+      const emptyHtml = '''
-        'test/utils/bookmarks/fixtures/bookmarks_html_singleframe.html',
+        <!DOCTYPE NETSCAPE-Bookmark-file-1>
+        <TITLE>Bookmarks</TITLE>
+        <H1>Bookmarks</H1>
+        <DL><p>
+        </DL>
+      ''';
+
+      final tree = parseBookmarkHtml(emptyHtml, preserveRootFolders: true);
+
+      expect(tree.isEmpty, isTrue);
+      expect(tree.stats.bookmarkCount, equals(0));
+    });
+
+    test('should keep headings that never open a list', () {
+      // Firefox writes empty folders without a `<DL>`; the folder must still be
+      // emitted, and the heading after it must not inherit its metadata.
+      const html = '''
+        <!DOCTYPE NETSCAPE-Bookmark-file-1>
+        <H1>Bookmarks</H1>
+        <DL><p>
+          <DT><H3>First</H3>
+          <DT><H3 ADD_DATE="1177375336">Second</H3>
+          <DL><p>
+            <DT><A HREF="https://example.com">Child</A>
+          </DL><p>
+        </DL>
+      ''';
+
+      final tree = parseBookmarkHtml(html, preserveRootFolders: false);
+      final nodes = section(tree, BookmarkRoot.menu);
+
+      expect(nodes, hasLength(2));
+      expect((nodes[0] as ImportBookmarkFolder).title, equals('First'));
+      expect((nodes[0] as ImportBookmarkFolder).dateAdded, isNull);
+
+      final second = nodes[1] as ImportBookmarkFolder;
+      expect(second.title, equals('Second'));
+      expect(
+        second.dateAdded,
+        equals(DateTime.fromMillisecondsSinceEpoch(1177375336 * 1000)),
       );
-      final htmlString = await fixtureFile.readAsString();
+      expect(second.children, hasLength(1));
+    });
 
-      when(
+    test('should handle deeply nested folders', () {
-        mockService.addFolder(any, any, any),
+      const depth = 60;
-      ).thenAnswer((_) async => 'folder_guid');
+      final buffer = StringBuffer(
-      when(
+        '<!DOCTYPE NETSCAPE-Bookmark-file-1>\n<DL><p>',
-        mockService.addItem(any, any, any, any),
+      );
-      ).thenAnswer((_) async => 'bookmark_guid');
+      for (var i = 0; i < depth; i++) {
+        buffer.write('<DT><H3>Level $i</H3>\n<DL><p>');
+      }
+      buffer.write('<DT><A HREF="https://example.com">Deep</A>');
+      for (var i = 0; i < depth; i++) {
+        buffer.write('</DL><p>');
+      }
+      buffer.write('</DL>');
 
-      final count = await utils.importFromHTML(htmlString);
+      final tree = parseBookmarkHtml(
+        buffer.toString(),
+        preserveRootFolders: false,
+      );
 
-      expect(count, greaterThan(0));
+      var node = section(tree, BookmarkRoot.menu).single;
+      for (var i = 0; i < depth; i++) {
+        node = (node as ImportBookmarkFolder).children.single;
+      }
+      expect(node, isA<ImportBookmarkItem>());
+      expect(tree.stats.folderCount, equals(depth));
+    });
+
+    test('should parse the corrupt fixture without throwing', () async {
+      final htmlString = await File(
+        'test/utils/bookmarks/fixtures/bookmarks.corrupt.html',
+      ).readAsString();
+
+      final tree = parseBookmarkHtml(htmlString, preserveRootFolders: true);
+
+      expect(tree.stats.bookmarkCount, greaterThan(0));
+    });
+
+    test('should parse the pre-places fixture', () async {
+      final htmlString = await File(
+        'test/utils/bookmarks/fixtures/bookmarks.preplaces.html',
+      ).readAsString();
+
+      final tree = parseBookmarkHtml(htmlString, preserveRootFolders: true);
+
+      expect(tree.stats.bookmarkCount, greaterThan(0));
+    });
+
+    test('should parse the single frame fixture', () async {
+      final htmlString = await File(
+        'test/utils/bookmarks/fixtures/bookmarks_html_singleframe.html',
+      ).readAsString();
+
+      final tree = parseBookmarkHtml(htmlString, preserveRootFolders: false);
+
+      expect(tree.stats.bookmarkCount, greaterThan(0));
+    });
+  });
+
+  group('BookmarkHTMLUtils - Import', () {
+    test('should insert each section with a single bulk call', () async {
+      const htmlWithFolders = '''
+        <!DOCTYPE NETSCAPE-Bookmark-file-1>
+        <H1>Bookmarks</H1>
+        <DL><p>
+          <DT><H3>Parent Folder</H3>
+          <DL><p>
+            <DT><A HREF="https://example.com/1">Child 1</A>
+            <DT><H3>Nested Folder</H3>
+            <DL><p>
+              <DT><A HREF="https://example.com/2">Grandchild</A>
+            </DL><p>
+          </DL><p>
+        </DL>
+      ''';
+
+      final count = await utils.importFromHTML(htmlWithFolders);
+
+      expect(count, equals(2));
+      verify(mockService.insertTree(BookmarkRoot.menu.id, any)).called(1);
+      verifyNever(mockService.addItem(any, any, any, any));
+      verifyNever(mockService.addFolder(any, any, any));
+    });
+
+    test(
+      'should erase every root except the tree root when replacing',
+      () async {
+        final htmlString = await File(
+          'test/utils/bookmarks/fixtures/bookmarks.preplaces.html',
+        ).readAsString();
+
+        final count = await utils.importFromHTML(htmlString, replace: true);
+
+        expect(count, greaterThan(0));
+        for (final root in BookmarkRoot.values) {
+          if (root == BookmarkRoot.root) {
+            verifyNever(mockService.eraseEverything(root));
+          } else {
+            verify(mockService.eraseEverything(root)).called(1);
+          }
+        }
+      },
+    );
+
+    test('should not erase when replace is false', () async {
+      const simpleHtml = '''
+        <!DOCTYPE NETSCAPE-Bookmark-file-1>
+        <H1>Bookmarks</H1>
+        <DL><p>
+          <DT><A HREF="https://example.com">Example</A>
+        </DL>
+      ''';
+
+      await utils.importFromHTML(simpleHtml);
+
+      verifyNever(mockService.eraseEverything(any));
+    });
+
+    test('should route root-marked sections to their Places roots', () async {
+      const htmlWithToolbar = '''
+        <!DOCTYPE NETSCAPE-Bookmark-file-1>
+        <H1>Bookmarks</H1>
+        <DL><p>
+          <DT><H3 PERSONAL_TOOLBAR_FOLDER="true">Bookmarks Toolbar</H3>
+          <DL><p>
+            <DT><A HREF="https://example.com">Toolbar Bookmark</A>
+          </DL><p>
+        </DL>
+      ''';
+
+      await utils.importFromHTML(htmlWithToolbar, replace: true);
+
+      verify(mockService.insertTree(BookmarkRoot.toolbar.id, any)).called(1);
+    });
+
+    test('should insert nothing for an empty document', () async {
+      const emptyHtml = '''
+        <!DOCTYPE NETSCAPE-Bookmark-file-1>
+        <H1>Bookmarks</H1>
+        <DL><p>
+        </DL>
+      ''';
+
+      final count = await utils.importFromHTML(emptyHtml, replace: true);
+
+      expect(count, equals(0));
+      verifyNever(mockService.insertTree(any, any));
+      // Nothing parsed means nothing to replace, so existing bookmarks survive.
+      verifyNever(mockService.eraseEverything(any));
     });
   });
 
@@ -747,18 +981,24 @@ void main() {
       expect(html, isNotEmpty);
 
       // Re-import
-      when(mockService.eraseEverything(any)).thenAnswer((_) async {});
-      when(
-        mockService.addFolder(any, any, any),
-      ).thenAnswer((_) async => 'folder1_____');
-      when(
-        mockService.addItem(any, any, any, any),
-      ).thenAnswer((_) async => 'bookmark1___');
-
       final count = await utils.importFromHTML(html, replace: true);
 
       expect(count, equals(1)); // One bookmark imported
-      verify(mockService.eraseEverything(BookmarkRoot.root)).called(1);
+      verify(mockService.eraseEverything(BookmarkRoot.menu)).called(1);
+
+      final inserted =
+          verify(
+                mockService.insertTree(BookmarkRoot.menu.id, captureAny),
+              ).captured.single
+              as List<BookmarkImportNode>;
+
+      final folder = inserted.single;
+      expect(folder.type, equals(BookmarkNodeType.folder));
+      expect(folder.title, equals('Test Folder'));
+
+      final bookmark = folder.children.single;
+      expect(bookmark.title, equals('Test Bookmark'));
+      expect(bookmark.url, equals('https://example.com'));
     });
   });
 }

apps/weblibre/test/features/geckoview/features/bookmarks/utils/bookmark_html_utils_test.mocks.dart

@@ -3,11 +3,11 @@
 // Do not manually edit this file.
 
 // ignore_for_file: no_leading_underscores_for_library_prefixes
-import 'dart:async' as _i3;
+import 'dart:async' as _i4;
 
 import 'package:flutter_mozilla_components/src/domain/services/gecko_bookmarks.dart'
-    as _i2;
+    as _i3;
-import 'package:flutter_mozilla_components/src/pigeons/gecko.g.dart' as _i4;
+import 'package:flutter_mozilla_components/src/pigeons/gecko.g.dart' as _i2;
 import 'package:mockito/mockito.dart' as _i1;
 import 'package:mockito/src/dummies.dart' as _i5;
 
@@ -26,46 +26,52 @@ import 'package:mockito/src/dummies.dart' as _i5;
 // ignore_for_file: subtype_of_sealed_class
 // ignore_for_file: invalid_use_of_internal_member
 
+class _FakeBookmarkInsertTreeResult_0 extends _i1.SmartFake
+    implements _i2.BookmarkInsertTreeResult {
+  _FakeBookmarkInsertTreeResult_0(Object parent, Invocation parentInvocation)
+    : super(parent, parentInvocation);
+}
+
 /// A class which mocks [GeckoBookmarksService].
 ///
 /// See the documentation for Mockito's code generation for more information.
 class MockGeckoBookmarksService extends _i1.Mock
-    implements _i2.GeckoBookmarksService {
+    implements _i3.GeckoBookmarksService {
   MockGeckoBookmarksService() {
     _i1.throwOnMissingStub(this);
   }
 
   @override
-  _i3.Future<_i4.BookmarkNode?> getTree(
+  _i4.Future<_i2.BookmarkNode?> getTree(
     String? guid, {
     bool? recursive = false,
   }) =>
       (super.noSuchMethod(
             Invocation.method(#getTree, [guid], {#recursive: recursive}),
-            returnValue: _i3.Future<_i4.BookmarkNode?>.value(),
+            returnValue: _i4.Future<_i2.BookmarkNode?>.value(),
           )
-          as _i3.Future<_i4.BookmarkNode?>);
+          as _i4.Future<_i2.BookmarkNode?>);
 
   @override
-  _i3.Future<_i4.BookmarkNode?> getBookmark(String? guid) =>
+  _i4.Future<_i2.BookmarkNode?> getBookmark(String? guid) =>
       (super.noSuchMethod(
             Invocation.method(#getBookmark, [guid]),
-            returnValue: _i3.Future<_i4.BookmarkNode?>.value(),
+            returnValue: _i4.Future<_i2.BookmarkNode?>.value(),
           )
-          as _i3.Future<_i4.BookmarkNode?>);
+          as _i4.Future<_i2.BookmarkNode?>);
 
   @override
-  _i3.Future<List<_i4.BookmarkNode>> getBookmarksWithUrl(Uri? url) =>
+  _i4.Future<List<_i2.BookmarkNode>> getBookmarksWithUrl(Uri? url) =>
       (super.noSuchMethod(
             Invocation.method(#getBookmarksWithUrl, [url]),
-            returnValue: _i3.Future<List<_i4.BookmarkNode>>.value(
+            returnValue: _i4.Future<List<_i2.BookmarkNode>>.value(
-              <_i4.BookmarkNode>[],
+              <_i2.BookmarkNode>[],
             ),
           )
-          as _i3.Future<List<_i4.BookmarkNode>>);
+          as _i4.Future<List<_i2.BookmarkNode>>);
 
   @override
-  _i3.Future<List<_i4.BookmarkNode>> getRecentBookmarks(
+  _i4.Future<List<_i2.BookmarkNode>> getRecentBookmarks(
     int? limit, {
     Duration? maxAge = Duration.zero,
     DateTime? currentTime,
@@ -76,27 +82,27 @@ class MockGeckoBookmarksService extends _i1.Mock
               [limit],
               {#maxAge: maxAge, #currentTime: currentTime},
             ),
-            returnValue: _i3.Future<List<_i4.BookmarkNode>>.value(
+            returnValue: _i4.Future<List<_i2.BookmarkNode>>.value(
-              <_i4.BookmarkNode>[],
+              <_i2.BookmarkNode>[],
             ),
           )
-          as _i3.Future<List<_i4.BookmarkNode>>);
+          as _i4.Future<List<_i2.BookmarkNode>>);
 
   @override
-  _i3.Future<List<_i4.BookmarkNode>> searchBookmarks(
+  _i4.Future<List<_i2.BookmarkNode>> searchBookmarks(
     String? query, {
     int? limit = 10,
   }) =>
       (super.noSuchMethod(
             Invocation.method(#searchBookmarks, [query], {#limit: limit}),
-            returnValue: _i3.Future<List<_i4.BookmarkNode>>.value(
+            returnValue: _i4.Future<List<_i2.BookmarkNode>>.value(
-              <_i4.BookmarkNode>[],
+              <_i2.BookmarkNode>[],
             ),
           )
-          as _i3.Future<List<_i4.BookmarkNode>>);
+          as _i4.Future<List<_i2.BookmarkNode>>);
 
   @override
-  _i3.Future<String> addItem(
+  _i4.Future<String> addItem(
     String? parentGuid,
     Uri? url,
     String? title,
@@ -104,55 +110,79 @@ class MockGeckoBookmarksService extends _i1.Mock
   ) =>
       (super.noSuchMethod(
             Invocation.method(#addItem, [parentGuid, url, title, position]),
-            returnValue: _i3.Future<String>.value(
+            returnValue: _i4.Future<String>.value(
               _i5.dummyValue<String>(
                 this,
                 Invocation.method(#addItem, [parentGuid, url, title, position]),
               ),
             ),
           )
-          as _i3.Future<String>);
+          as _i4.Future<String>);
 
   @override
-  _i3.Future<String> addFolder(
+  _i4.Future<String> addFolder(
     String? parentGuid,
     String? title,
     int? position,
   ) =>
       (super.noSuchMethod(
             Invocation.method(#addFolder, [parentGuid, title, position]),
-            returnValue: _i3.Future<String>.value(
+            returnValue: _i4.Future<String>.value(
               _i5.dummyValue<String>(
                 this,
                 Invocation.method(#addFolder, [parentGuid, title, position]),
               ),
             ),
           )
-          as _i3.Future<String>);
+          as _i4.Future<String>);
 
   @override
-  _i3.Future<void> updateNode(String? guid, _i4.BookmarkInfo? info) =>
+  _i4.Future<void> updateNode(String? guid, _i2.BookmarkInfo? info) =>
       (super.noSuchMethod(
             Invocation.method(#updateNode, [guid, info]),
-            returnValue: _i3.Future<void>.value(),
+            returnValue: _i4.Future<void>.value(),
-            returnValueForMissingStub: _i3.Future<void>.value(),
+            returnValueForMissingStub: _i4.Future<void>.value(),
           )
-          as _i3.Future<void>);
+          as _i4.Future<void>);
 
   @override
-  _i3.Future<bool> deleteNode(String? guid) =>
+  _i4.Future<bool> deleteNode(String? guid) =>
       (super.noSuchMethod(
             Invocation.method(#deleteNode, [guid]),
-            returnValue: _i3.Future<bool>.value(false),
+            returnValue: _i4.Future<bool>.value(false),
           )
-          as _i3.Future<bool>);
+          as _i4.Future<bool>);
 
   @override
-  _i3.Future<void> eraseEverything(_i2.BookmarkRoot? root) =>
+  _i4.Future<_i2.BookmarkInsertTreeResult> insertTree(
+    String? parentGuid,
+    List<_i2.BookmarkImportNode>? children,
+  ) =>
+      (super.noSuchMethod(
+            Invocation.method(#insertTree, [parentGuid, children]),
+            returnValue: _i4.Future<_i2.BookmarkInsertTreeResult>.value(
+              _FakeBookmarkInsertTreeResult_0(
+                this,
+                Invocation.method(#insertTree, [parentGuid, children]),
+              ),
+            ),
+          )
+          as _i4.Future<_i2.BookmarkInsertTreeResult>);
+
+  @override
+  _i4.Future<int> countBookmarksInTrees(List<String>? guids) =>
+      (super.noSuchMethod(
+            Invocation.method(#countBookmarksInTrees, [guids]),
+            returnValue: _i4.Future<int>.value(0),
+          )
+          as _i4.Future<int>);
+
+  @override
+  _i4.Future<void> eraseEverything(_i3.BookmarkRoot? root) =>
       (super.noSuchMethod(
             Invocation.method(#eraseEverything, [root]),
-            returnValue: _i3.Future<void>.value(),
+            returnValue: _i4.Future<void>.value(),
-            returnValueForMissingStub: _i3.Future<void>.value(),
+            returnValueForMissingStub: _i4.Future<void>.value(),
           )
-          as _i3.Future<void>);
+          as _i4.Future<void>);
 }

apps/weblibre/test/features/geckoview/features/bookmarks/utils/bookmark_import_isolate_test.dart

@@ -0,0 +1,137 @@
+/*
+ * Copyright (c) 2024-2026 Fabian Freund.
+ *
+ * This file is part of WebLibre
+ * (see https://weblibre.eu).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import 'dart:io';
+
+import 'package:flutter_mozilla_components/flutter_mozilla_components.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:weblibre/features/geckoview/features/bookmarks/domain/entities/import_bookmark_node.dart';
+import 'package:weblibre/features/geckoview/features/bookmarks/utils/bookmark_import_isolate.dart';
+
+void main() {
+  late Directory tempDir;
+
+  setUp(() async {
+    tempDir = await Directory.systemTemp.createTemp('bookmark-import-test');
+  });
+
+  tearDown(() async {
+    await tempDir.delete(recursive: true);
+  });
+
+  Future<File> writeFixture(String name, String contents) async {
+    final file = File('${tempDir.path}/$name');
+    await file.writeAsString(contents);
+    return file;
+  }
+
+  group('parseBookmarkFile', () {
+    test('should return an HTML tree across the isolate boundary', () async {
+      final file = await writeFixture('bookmarks.html', '''
+        <!DOCTYPE NETSCAPE-Bookmark-file-1>
+        <H1>Bookmarks</H1>
+        <DL><p>
+          <DT><H3>Folder</H3>
+          <DL><p>
+            <DT><A HREF="https://example.com" ADD_DATE="1177375336">Example</A>
+            <HR>
+          </DL><p>
+        </DL>
+      ''');
+
+      final tree = await parseBookmarkFile(
+        path: file.path,
+        format: BookmarkImportFormat.html,
+        preserveRootFolders: false,
+      );
+
+      final folder =
+          tree.sections[BookmarkRoot.menu.id]!.single as ImportBookmarkFolder;
+      expect(folder.title, equals('Folder'));
+
+      final item = folder.children[0] as ImportBookmarkItem;
+      expect(item.url, equals(Uri.parse('https://example.com')));
+      expect(
+        item.dateAdded,
+        equals(DateTime.fromMillisecondsSinceEpoch(1177375336 * 1000)),
+      );
+      expect(folder.children[1], isA<ImportBookmarkSeparator>());
+
+      expect(tree.stats.bookmarkCount, equals(1));
+      expect(tree.stats.separatorCount, equals(1));
+    });
+
+    test('should return a JSON tree across the isolate boundary', () async {
+      final file = await writeFixture('bookmarks.json', '''
+        {
+          "children": [
+            {
+              "guid": "menu________",
+              "type": "text/x-moz-place-container",
+              "children": [
+                {
+                  "guid": "bookmark1___",
+                  "title": "Example",
+                  "type": "text/x-moz-place",
+                  "uri": "https://example.com"
+                }
+              ]
+            }
+          ]
+        }
+      ''');
+
+      final tree = await parseBookmarkFile(
+        path: file.path,
+        format: BookmarkImportFormat.json,
+        preserveRootFolders: false,
+      );
+
+      final item =
+          tree.sections[BookmarkRoot.menu.id]!.single as ImportBookmarkItem;
+      expect(item.title, equals('Example'));
+      expect(item.url, equals(Uri.parse('https://example.com')));
+    });
+
+    test('should propagate a missing file as an error', () {
+      expect(
+        parseBookmarkFile(
+          path: '${tempDir.path}/does-not-exist.html',
+          format: BookmarkImportFormat.html,
+          preserveRootFolders: false,
+        ),
+        throwsA(isA<FileSystemException>()),
+      );
+    });
+
+    test('should propagate a malformed JSON document as an error', () async {
+      final file = await writeFixture('broken.json', '{not json');
+
+      expect(
+        parseBookmarkFile(
+          path: file.path,
+          format: BookmarkImportFormat.json,
+          preserveRootFolders: false,
+        ),
+        throwsA(isA<FormatException>()),
+      );
+    });
+  });
+}

apps/weblibre/test/features/geckoview/features/bookmarks/utils/bookmark_json_utils_test.dart

@@ -27,11 +27,26 @@ import 'package:flutter_mozilla_components/flutter_mozilla_components.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:mockito/annotations.dart';
 import 'package:mockito/mockito.dart';
+import 'package:weblibre/features/geckoview/features/bookmarks/domain/entities/import_bookmark_node.dart';
 import 'package:weblibre/features/geckoview/features/bookmarks/utils/bookmark_json_utils.dart';
 
 @GenerateMocks([GeckoBookmarksService])
 import 'bookmark_json_utils_test.mocks.dart';
 
+/// Nodes the parser routed to [root], or an empty list if it produced no such
+/// section.
+List<ImportBookmarkNode> section(ImportBookmarkTree tree, BookmarkRoot root) =>
+    tree.sections[root.id] ?? const [];
+
+/// Mirrors what the native side reports back: bookmark items only, recursively.
+int countItems(List<BookmarkImportNode> nodes) => nodes.fold(
+  0,
+  (total, node) =>
+      total +
+      (node.type == BookmarkNodeType.item ? 1 : 0) +
+      countItems(node.children),
+);
+
 void main() {
   late MockGeckoBookmarksService mockService;
   late BookmarkJSONUtils utils;
@@ -39,108 +54,52 @@ void main() {
   setUp(() {
     mockService = MockGeckoBookmarksService();
     utils = BookmarkJSONUtils(mockService);
+
+    when(mockService.eraseEverything(any)).thenAnswer((_) async {});
+    when(mockService.insertTree(any, any)).thenAnswer(
+      (invocation) async => BookmarkInsertTreeResult(
+        insertedItemCount: countItems(
+          invocation.positionalArguments[1] as List<BookmarkImportNode>,
+        ),
+        failedNodeCount: 0,
+      ),
+    );
   });
 
-  group('BookmarkJSONUtils - Import', () {
+  group('parseBookmarkJson', () {
-    test('should reject invalid JSON format', () {
+    test('should reject a document that is not an object', () {
-      const invalidJson = '[]';
+      expect(() => parseBookmarkJson('[]'), throwsA(isA<FormatException>()));
-
-      expect(
-        () => utils.importFromJSON(invalidJson),
-        throwsA(isA<Exception>()),
-      );
     });
 
-    test('should return 0 for empty children', () async {
+    test('should produce nothing for empty or missing children', () {
-      const emptyJson = '{"children": []}';
+      expect(parseBookmarkJson('{"children": []}').isEmpty, isTrue);
-
+      expect(parseBookmarkJson('{"guid": "root________"}').isEmpty, isTrue);
-      final count = await utils.importFromJSON(emptyJson);
-
-      expect(count, equals(0));
     });
 
-    test('should return 0 when children is null', () async {
+    test('should filter out the tags folder', () {
-      const noChildrenJson = '{"guid": "root________"}';
-
-      final count = await utils.importFromJSON(noChildrenJson);
-
-      expect(count, equals(0));
-    });
-
-    test('should filter out tags folder during import', () async {
       final jsonData = {
         'children': [
           {
             'guid': 'tags________',
             'root': 'tagsFolder',
             'type': 'text/x-moz-place-container',
-            'children': [],
+            'children': [
+              {
+                'guid': 'tag1________',
+                'title': 'Tagged',
+                'type': 'text/x-moz-place',
+                'uri': 'https://example.com/tagged',
+              },
+            ],
           },
           {
             'guid': 'menu________',
             'root': 'bookmarksMenuFolder',
             'type': 'text/x-moz-place-container',
-            'children': [],
-          },
-        ],
-      };
-
-      when(mockService.eraseEverything(any)).thenAnswer((_) async {});
-
-      final count = await utils.importFromJSON(
-        jsonEncode(jsonData),
-        replace: true,
-      );
-
-      // Only the menu folder should be processed, tags should be filtered
-      expect(count, equals(0)); // No bookmarks, just folders
-      verify(mockService.eraseEverything(BookmarkRoot.root)).called(1);
-    });
-
-    test('should erase everything when replace is true', () async {
-      final jsonData = {
-        'children': [
-          {
-            'guid': 'menu________',
-            'type': 'text/x-moz-place-container',
-            'children': [],
-          },
-        ],
-      };
-
-      when(mockService.eraseEverything(any)).thenAnswer((_) async {});
-
-      await utils.importFromJSON(jsonEncode(jsonData), replace: true);
-
-      verify(mockService.eraseEverything(BookmarkRoot.root)).called(1);
-    });
-
-    test('should not erase when replace is false', () async {
-      final jsonData = {
-        'children': [
-          {
-            'guid': 'menu________',
-            'type': 'text/x-moz-place-container',
-            'children': [],
-          },
-        ],
-      };
-
-      await utils.importFromJSON(jsonEncode(jsonData));
-
-      verifyNever(mockService.eraseEverything(any));
-    });
-
-    test('should import bookmarks with URI field', () async {
-      final jsonData = {
-        'children': [
-          {
-            'guid': 'menu________',
-            'type': 'text/x-moz-place-container',
             'children': [
               {
                 'guid': 'bookmark1___',
-                'title': 'Test Bookmark',
+                'title': 'Kept',
                 'type': 'text/x-moz-place',
                 'uri': 'https://example.com',
               },
@@ -149,59 +108,65 @@ void main() {
         ],
       };
 
-      when(
+      final tree = parseBookmarkJson(jsonEncode(jsonData));
-        mockService.addItem(any, any, any, any),
-      ).thenAnswer((_) async => 'bookmark1___');
 
-      final count = await utils.importFromJSON(jsonEncode(jsonData));
+      expect(tree.sections.keys, equals([BookmarkRoot.menu.id]));
-
+      expect(tree.stats.bookmarkCount, equals(1));
-      expect(count, equals(1));
-      verify(
-        mockService.addItem(
-          'menu________',
-          Uri.parse('https://example.com'),
-          'Test Bookmark',
-          0,
-        ),
-      ).called(1);
     });
 
-    test('should import bookmarks with URL field', () async {
+    test('should ignore top-level nodes that are not Places roots', () {
       final jsonData = {
         'children': [
           {
-            'guid': 'menu________',
+            'guid': 'notaroot____',
             'type': 'text/x-moz-place-container',
             'children': [
               {
                 'guid': 'bookmark1___',
-                'title': 'Test Bookmark',
+                'title': 'Orphan',
                 'type': 'text/x-moz-place',
-                'url': 'https://example.com',
+                'uri': 'https://example.com',
               },
             ],
           },
         ],
       };
 
-      when(
+      expect(parseBookmarkJson(jsonEncode(jsonData)).isEmpty, isTrue);
-        mockService.addItem(any, any, any, any),
-      ).thenAnswer((_) async => 'bookmark1___');
-
-      final count = await utils.importFromJSON(jsonEncode(jsonData));
-
-      expect(count, equals(1));
-      verify(
-        mockService.addItem(
-          'menu________',
-          Uri.parse('https://example.com'),
-          'Test Bookmark',
-          0,
-        ),
-      ).called(1);
     });
 
-    test('should skip bookmarks with invalid URLs', () async {
+    test('should accept both the uri and url fields', () {
+      for (final field in ['uri', 'url']) {
+        final jsonData = {
+          'children': [
+            {
+              'guid': 'menu________',
+              'type': 'text/x-moz-place-container',
+              'children': [
+                {
+                  'guid': 'bookmark1___',
+                  'title': 'Test Bookmark',
+                  'type': 'text/x-moz-place',
+                  field: 'https://example.com',
+                },
+              ],
+            },
+          ],
+        };
+
+        final tree = parseBookmarkJson(jsonEncode(jsonData));
+
+        expect(
+          section(tree, BookmarkRoot.menu).single,
+          isA<ImportBookmarkItem>()
+              .having((i) => i.url, 'url', Uri.parse('https://example.com'))
+              .having((i) => i.title, 'title', 'Test Bookmark'),
+          reason: 'field "$field" should be read as the bookmark URL',
+        );
+      }
+    });
+
+    test('should skip bookmarks with invalid URLs', () {
       final jsonData = {
         'children': [
           {
@@ -225,26 +190,13 @@ void main() {
         ],
       };
 
-      when(
+      final tree = parseBookmarkJson(jsonEncode(jsonData));
-        mockService.addItem(any, any, any, any),
-      ).thenAnswer((_) async => 'valid1______');
 
-      final count = await utils.importFromJSON(jsonEncode(jsonData));
+      expect(section(tree, BookmarkRoot.menu), hasLength(1));
-
+      expect(tree.stats.skippedUrlCount, equals(1));
-      // Only one valid bookmark should be imported
-      expect(count, equals(1));
-      // Note: position is 1 because the invalid bookmark was skipped first
-      verify(
-        mockService.addItem(
-          'menu________',
-          Uri.parse('https://example.com'),
-          'Valid URL',
-          1,
-        ),
-      ).called(1);
     });
 
-    test('should import nested folders recursively', () async {
+    test('should nest folders recursively', () {
       final jsonData = {
         'children': [
           {
@@ -269,28 +221,20 @@ void main() {
         ],
       };
 
-      when(
+      final tree = parseBookmarkJson(jsonEncode(jsonData));
-        mockService.addFolder(any, any, any),
-      ).thenAnswer((_) async => 'folder1_____');
-      when(
-        mockService.addItem(any, any, any, any),
-      ).thenAnswer((_) async => 'bookmark1___');
 
-      final count = await utils.importFromJSON(jsonEncode(jsonData));
+      final folder =
-
+          section(tree, BookmarkRoot.menu).single as ImportBookmarkFolder;
-      expect(count, equals(1));
+      expect(folder.title, equals('Folder 1'));
-      verify(mockService.addFolder('menu________', 'Folder 1', 0)).called(1);
+      expect(
-      verify(
+        (folder.children.single as ImportBookmarkItem).title,
-        mockService.addItem(
+        equals('Nested Bookmark'),
-          'folder1_____',
+      );
-          Uri.parse('https://example.com'),
+      expect(tree.stats.bookmarkCount, equals(1));
-          'Nested Bookmark',
+      expect(tree.stats.folderCount, equals(1));
-          0,
-        ),
-      ).called(1);
     });
 
-    test('should handle separators gracefully (skip them)', () async {
+    test('should keep separators', () {
       final jsonData = {
         'children': [
           {
@@ -315,18 +259,80 @@ void main() {
         ],
       };
 
-      when(
+      final tree = parseBookmarkJson(jsonEncode(jsonData));
-        mockService.addItem(any, any, any, any),
+      final nodes = section(tree, BookmarkRoot.menu);
-      ).thenAnswer((invocation) async => 'generated_guid');
 
-      final count = await utils.importFromJSON(jsonEncode(jsonData));
+      expect(nodes, hasLength(3));
-
+      expect(nodes[1], isA<ImportBookmarkSeparator>());
-      // Two bookmarks, separator should be skipped
+      expect(tree.stats.bookmarkCount, equals(2));
-      expect(count, equals(2));
+      expect(tree.stats.separatorCount, equals(1));
-      verify(mockService.addItem(any, any, any, any)).called(2);
     });
 
-    test('should fixup place: queries with folder shortcuts', () async {
+    test('should read microsecond timestamps from Firefox backups', () {
+      final jsonData = {
+        'children': [
+          {
+            'guid': 'menu________',
+            'type': 'text/x-moz-place-container',
+            'children': [
+              {
+                'guid': 'bookmark1___',
+                'title': 'Dated',
+                'type': 'text/x-moz-place',
+                'uri': 'https://example.com',
+                'dateAdded': 1361551979350273,
+                'lastModified': 1361551979376699,
+              },
+            ],
+          },
+        ],
+      };
+
+      final tree = parseBookmarkJson(jsonEncode(jsonData));
+
+      final item =
+          section(tree, BookmarkRoot.menu).single as ImportBookmarkItem;
+      expect(
+        item.dateAdded,
+        equals(DateTime.fromMillisecondsSinceEpoch(1361551979350)),
+      );
+      expect(
+        item.lastModified,
+        equals(DateTime.fromMillisecondsSinceEpoch(1361551979376)),
+      );
+    });
+
+    test('should read millisecond timestamps from WebLibre exports', () {
+      final jsonData = {
+        'children': [
+          {
+            'guid': 'menu________',
+            'type': 'text/x-moz-place-container',
+            'children': [
+              {
+                'guid': 'bookmark1___',
+                'title': 'Dated',
+                'type': 'text/x-moz-place',
+                'uri': 'https://example.com',
+                'dateAdded': 1361551979350,
+              },
+            ],
+          },
+        ],
+      };
+
+      final tree = parseBookmarkJson(jsonEncode(jsonData));
+
+      final item =
+          section(tree, BookmarkRoot.menu).single as ImportBookmarkItem;
+      expect(
+        item.dateAdded,
+        equals(DateTime.fromMillisecondsSinceEpoch(1361551979350)),
+      );
+      expect(item.lastModified, isNull);
+    });
+
+    test('should fixup place: queries with folder shortcuts', () {
       final jsonData = {
         'children': [
           {
@@ -352,25 +358,14 @@ void main() {
         ],
       };
 
-      when(
+      final tree = parseBookmarkJson(jsonEncode(jsonData));
-        mockService.addFolder(any, any, any),
-      ).thenAnswer((_) async => 'folder1_____');
-      when(
-        mockService.addItem(any, any, any, any),
-      ).thenAnswer((_) async => 'shortcut1___');
 
-      await utils.importFromJSON(jsonEncode(jsonData));
+      final shortcut =
-
+          section(tree, BookmarkRoot.unfiled)[1] as ImportBookmarkItem;
-      // Capture the URI argument to verify it was fixed up
+      expect(shortcut.url.toString(), contains('parent=folder1_____'));
-      // Note: position is 1 because the folder was added first at position 0
-      final captured = verify(
-        mockService.addItem('unfiled_____', captureAny, 'Folder Shortcut', 1),
-      ).captured;
-
-      expect((captured[0] as Uri).toString(), contains('parent=folder1_____'));
     });
 
-    test('should handle invalid folder references in place: queries', () async {
+    test('should handle invalid folder references in place: queries', () {
       final jsonData = {
         'children': [
           {
@@ -388,48 +383,129 @@ void main() {
         ],
       };
 
-      when(
+      final tree = parseBookmarkJson(jsonEncode(jsonData));
-        mockService.addItem(any, any, any, any),
-      ).thenAnswer((_) async => 'shortcut1___');
 
-      await utils.importFromJSON(jsonEncode(jsonData));
+      final url =
-
+          (section(tree, BookmarkRoot.unfiled).single as ImportBookmarkItem).url
-      final captured = verify(
+              .toString();
-        mockService.addItem(
-          'unfiled_____',
-          captureAny,
-          'Invalid Folder Shortcut',
-          0,
-        ),
-      ).captured;
-
-      final url = (captured[0] as Uri).toString();
       expect(url, contains('invalidOldParentId=999999'));
       expect(url, contains('excludeItems=1'));
     });
 
-    test('should count imported bookmarks correctly from fixture', () async {
+    test('should parse the bookmarks fixture', () async {
-      // Load the fixture
+      final jsonString = await File(
-      final fixtureFile = File('test/utils/bookmarks/fixtures/bookmarks.json');
+        'test/utils/bookmarks/fixtures/bookmarks.json',
-      final jsonString = await fixtureFile.readAsString();
+      ).readAsString();
 
-      // Mock the service calls
+      final tree = parseBookmarkJson(jsonString);
-      when(mockService.eraseEverything(any)).thenAnswer((_) async {});
-      when(
-        mockService.addFolder(any, any, any),
-      ).thenAnswer((invocation) async => 'generated_guid');
-      when(
-        mockService.addItem(any, any, any, any),
-      ).thenAnswer((invocation) async => 'generated_guid');
 
-      final count = await utils.importFromJSON(jsonString, replace: true);
+      expect(tree.stats.bookmarkCount, greaterThan(0));
+    });
+  });
 
-      // The fixture has several bookmarks - we should count only valid ones
+  group('BookmarkJSONUtils - Import', () {
-      expect(count, greaterThan(0));
+    test('should reject invalid JSON format', () {
-      verify(mockService.eraseEverything(BookmarkRoot.root)).called(1);
+      expect(() => utils.importFromJSON('[]'), throwsA(isA<Exception>()));
     });
 
-    test('should handle import errors gracefully', () async {
+    test('should return 0 without touching storage for empty input', () async {
+      expect(await utils.importFromJSON('{"children": []}'), equals(0));
+      expect(await utils.importFromJSON('{"guid": "root________"}'), equals(0));
+
+      verifyNever(mockService.insertTree(any, any));
+      verifyNever(mockService.eraseEverything(any));
+    });
+
+    test('should insert each root section with a single bulk call', () async {
+      final jsonData = {
+        'children': [
+          {
+            'guid': 'menu________',
+            'type': 'text/x-moz-place-container',
+            'children': [
+              {
+                'guid': 'folder1_____',
+                'title': 'Folder 1',
+                'type': 'text/x-moz-place-container',
+                'children': [
+                  {
+                    'guid': 'bookmark1___',
+                    'title': 'Nested Bookmark',
+                    'type': 'text/x-moz-place',
+                    'uri': 'https://example.com',
+                  },
+                ],
+              },
+            ],
+          },
+          {
+            'guid': 'unfiled_____',
+            'type': 'text/x-moz-place-container',
+            'children': [
+              {
+                'guid': 'bookmark2___',
+                'title': 'Unfiled Bookmark',
+                'type': 'text/x-moz-place',
+                'uri': 'https://example.com/2',
+              },
+            ],
+          },
+        ],
+      };
+
+      final count = await utils.importFromJSON(jsonEncode(jsonData));
+
+      expect(count, equals(2));
+      verify(mockService.insertTree(BookmarkRoot.menu.id, any)).called(1);
+      verify(mockService.insertTree(BookmarkRoot.unfiled.id, any)).called(1);
+      verifyNever(mockService.addItem(any, any, any, any));
+      verifyNever(mockService.addFolder(any, any, any));
+    });
+
+    test(
+      'should erase every root except the tree root when replacing',
+      () async {
+        final jsonString = await File(
+          'test/utils/bookmarks/fixtures/bookmarks.json',
+        ).readAsString();
+
+        final count = await utils.importFromJSON(jsonString, replace: true);
+
+        expect(count, greaterThan(0));
+        for (final root in BookmarkRoot.values) {
+          if (root == BookmarkRoot.root) {
+            verifyNever(mockService.eraseEverything(root));
+          } else {
+            verify(mockService.eraseEverything(root)).called(1);
+          }
+        }
+      },
+    );
+
+    test('should not erase when replace is false', () async {
+      final jsonData = {
+        'children': [
+          {
+            'guid': 'menu________',
+            'type': 'text/x-moz-place-container',
+            'children': [
+              {
+                'guid': 'bookmark1___',
+                'title': 'Test Bookmark',
+                'type': 'text/x-moz-place',
+                'uri': 'https://example.com',
+              },
+            ],
+          },
+        ],
+      };
+
+      await utils.importFromJSON(jsonEncode(jsonData));
+
+      verifyNever(mockService.eraseEverything(any));
+    });
+
+    test('should rethrow storage failures', () {
       final jsonData = {
         'children': [
           {
@@ -448,13 +524,13 @@ void main() {
       };
 
       when(
-        mockService.addItem(any, any, any, any),
+        mockService.insertTree(any, any),
       ).thenThrow(Exception('Database error'));
 
-      // Should not throw, but should log and continue
+      expect(
-      final count = await utils.importFromJSON(jsonEncode(jsonData));
+        () => utils.importFromJSON(jsonEncode(jsonData)),
-
+        throwsA(isA<Exception>()),
-      expect(count, equals(0)); // Failed to add
+      );
     });
   });
 
@@ -776,21 +852,27 @@ void main() {
       expect(exported, isNotNull);
 
       // Re-import
-      when(mockService.eraseEverything(any)).thenAnswer((_) async {});
-      when(
-        mockService.addFolder(any, any, any),
-      ).thenAnswer((_) async => 'folder1_____');
-      when(
-        mockService.addItem(any, any, any, any),
-      ).thenAnswer((_) async => 'bookmark1___');
-
       final jsonString = jsonEncode({
         'children': [exported],
       });
       final count = await utils.importFromJSON(jsonString, replace: true);
 
       expect(count, equals(1)); // One bookmark imported
-      verify(mockService.eraseEverything(BookmarkRoot.root)).called(1);
+      verify(mockService.eraseEverything(BookmarkRoot.menu)).called(1);
+
+      final inserted =
+          verify(
+                mockService.insertTree(BookmarkRoot.menu.id, captureAny),
+              ).captured.single
+              as List<BookmarkImportNode>;
+
+      final folder = inserted.single;
+      expect(folder.type, equals(BookmarkNodeType.folder));
+      expect(folder.title, equals('Test Folder'));
+
+      final bookmark = folder.children.single;
+      expect(bookmark.title, equals('Test Bookmark'));
+      expect(bookmark.url, equals('https://example.com'));
     });
   });
 }

apps/weblibre/test/features/geckoview/features/bookmarks/utils/bookmark_json_utils_test.mocks.dart

@@ -3,11 +3,11 @@
 // Do not manually edit this file.
 
 // ignore_for_file: no_leading_underscores_for_library_prefixes
-import 'dart:async' as _i3;
+import 'dart:async' as _i4;
 
 import 'package:flutter_mozilla_components/src/domain/services/gecko_bookmarks.dart'
-    as _i2;
+    as _i3;
-import 'package:flutter_mozilla_components/src/pigeons/gecko.g.dart' as _i4;
+import 'package:flutter_mozilla_components/src/pigeons/gecko.g.dart' as _i2;
 import 'package:mockito/mockito.dart' as _i1;
 import 'package:mockito/src/dummies.dart' as _i5;
 
@@ -26,46 +26,52 @@ import 'package:mockito/src/dummies.dart' as _i5;
 // ignore_for_file: subtype_of_sealed_class
 // ignore_for_file: invalid_use_of_internal_member
 
+class _FakeBookmarkInsertTreeResult_0 extends _i1.SmartFake
+    implements _i2.BookmarkInsertTreeResult {
+  _FakeBookmarkInsertTreeResult_0(Object parent, Invocation parentInvocation)
+    : super(parent, parentInvocation);
+}
+
 /// A class which mocks [GeckoBookmarksService].
 ///
 /// See the documentation for Mockito's code generation for more information.
 class MockGeckoBookmarksService extends _i1.Mock
-    implements _i2.GeckoBookmarksService {
+    implements _i3.GeckoBookmarksService {
   MockGeckoBookmarksService() {
     _i1.throwOnMissingStub(this);
   }
 
   @override
-  _i3.Future<_i4.BookmarkNode?> getTree(
+  _i4.Future<_i2.BookmarkNode?> getTree(
     String? guid, {
     bool? recursive = false,
   }) =>
       (super.noSuchMethod(
             Invocation.method(#getTree, [guid], {#recursive: recursive}),
-            returnValue: _i3.Future<_i4.BookmarkNode?>.value(),
+            returnValue: _i4.Future<_i2.BookmarkNode?>.value(),
           )
-          as _i3.Future<_i4.BookmarkNode?>);
+          as _i4.Future<_i2.BookmarkNode?>);
 
   @override
-  _i3.Future<_i4.BookmarkNode?> getBookmark(String? guid) =>
+  _i4.Future<_i2.BookmarkNode?> getBookmark(String? guid) =>
       (super.noSuchMethod(
             Invocation.method(#getBookmark, [guid]),
-            returnValue: _i3.Future<_i4.BookmarkNode?>.value(),
+            returnValue: _i4.Future<_i2.BookmarkNode?>.value(),
           )
-          as _i3.Future<_i4.BookmarkNode?>);
+          as _i4.Future<_i2.BookmarkNode?>);
 
   @override
-  _i3.Future<List<_i4.BookmarkNode>> getBookmarksWithUrl(Uri? url) =>
+  _i4.Future<List<_i2.BookmarkNode>> getBookmarksWithUrl(Uri? url) =>
       (super.noSuchMethod(
             Invocation.method(#getBookmarksWithUrl, [url]),
-            returnValue: _i3.Future<List<_i4.BookmarkNode>>.value(
+            returnValue: _i4.Future<List<_i2.BookmarkNode>>.value(
-              <_i4.BookmarkNode>[],
+              <_i2.BookmarkNode>[],
             ),
           )
-          as _i3.Future<List<_i4.BookmarkNode>>);
+          as _i4.Future<List<_i2.BookmarkNode>>);
 
   @override
-  _i3.Future<List<_i4.BookmarkNode>> getRecentBookmarks(
+  _i4.Future<List<_i2.BookmarkNode>> getRecentBookmarks(
     int? limit, {
     Duration? maxAge = Duration.zero,
     DateTime? currentTime,
@@ -76,27 +82,27 @@ class MockGeckoBookmarksService extends _i1.Mock
               [limit],
               {#maxAge: maxAge, #currentTime: currentTime},
             ),
-            returnValue: _i3.Future<List<_i4.BookmarkNode>>.value(
+            returnValue: _i4.Future<List<_i2.BookmarkNode>>.value(
-              <_i4.BookmarkNode>[],
+              <_i2.BookmarkNode>[],
             ),
           )
-          as _i3.Future<List<_i4.BookmarkNode>>);
+          as _i4.Future<List<_i2.BookmarkNode>>);
 
   @override
-  _i3.Future<List<_i4.BookmarkNode>> searchBookmarks(
+  _i4.Future<List<_i2.BookmarkNode>> searchBookmarks(
     String? query, {
     int? limit = 10,
   }) =>
       (super.noSuchMethod(
             Invocation.method(#searchBookmarks, [query], {#limit: limit}),
-            returnValue: _i3.Future<List<_i4.BookmarkNode>>.value(
+            returnValue: _i4.Future<List<_i2.BookmarkNode>>.value(
-              <_i4.BookmarkNode>[],
+              <_i2.BookmarkNode>[],
             ),
           )
-          as _i3.Future<List<_i4.BookmarkNode>>);
+          as _i4.Future<List<_i2.BookmarkNode>>);
 
   @override
-  _i3.Future<String> addItem(
+  _i4.Future<String> addItem(
     String? parentGuid,
     Uri? url,
     String? title,
@@ -104,55 +110,79 @@ class MockGeckoBookmarksService extends _i1.Mock
   ) =>
       (super.noSuchMethod(
             Invocation.method(#addItem, [parentGuid, url, title, position]),
-            returnValue: _i3.Future<String>.value(
+            returnValue: _i4.Future<String>.value(
               _i5.dummyValue<String>(
                 this,
                 Invocation.method(#addItem, [parentGuid, url, title, position]),
               ),
             ),
           )
-          as _i3.Future<String>);
+          as _i4.Future<String>);
 
   @override
-  _i3.Future<String> addFolder(
+  _i4.Future<String> addFolder(
     String? parentGuid,
     String? title,
     int? position,
   ) =>
       (super.noSuchMethod(
             Invocation.method(#addFolder, [parentGuid, title, position]),
-            returnValue: _i3.Future<String>.value(
+            returnValue: _i4.Future<String>.value(
               _i5.dummyValue<String>(
                 this,
                 Invocation.method(#addFolder, [parentGuid, title, position]),
               ),
             ),
           )
-          as _i3.Future<String>);
+          as _i4.Future<String>);
 
   @override
-  _i3.Future<void> updateNode(String? guid, _i4.BookmarkInfo? info) =>
+  _i4.Future<void> updateNode(String? guid, _i2.BookmarkInfo? info) =>
       (super.noSuchMethod(
             Invocation.method(#updateNode, [guid, info]),
-            returnValue: _i3.Future<void>.value(),
+            returnValue: _i4.Future<void>.value(),
-            returnValueForMissingStub: _i3.Future<void>.value(),
+            returnValueForMissingStub: _i4.Future<void>.value(),
           )
-          as _i3.Future<void>);
+          as _i4.Future<void>);
 
   @override
-  _i3.Future<bool> deleteNode(String? guid) =>
+  _i4.Future<bool> deleteNode(String? guid) =>
       (super.noSuchMethod(
             Invocation.method(#deleteNode, [guid]),
-            returnValue: _i3.Future<bool>.value(false),
+            returnValue: _i4.Future<bool>.value(false),
           )
-          as _i3.Future<bool>);
+          as _i4.Future<bool>);
 
   @override
-  _i3.Future<void> eraseEverything(_i2.BookmarkRoot? root) =>
+  _i4.Future<_i2.BookmarkInsertTreeResult> insertTree(
+    String? parentGuid,
+    List<_i2.BookmarkImportNode>? children,
+  ) =>
+      (super.noSuchMethod(
+            Invocation.method(#insertTree, [parentGuid, children]),
+            returnValue: _i4.Future<_i2.BookmarkInsertTreeResult>.value(
+              _FakeBookmarkInsertTreeResult_0(
+                this,
+                Invocation.method(#insertTree, [parentGuid, children]),
+              ),
+            ),
+          )
+          as _i4.Future<_i2.BookmarkInsertTreeResult>);
+
+  @override
+  _i4.Future<int> countBookmarksInTrees(List<String>? guids) =>
+      (super.noSuchMethod(
+            Invocation.method(#countBookmarksInTrees, [guids]),
+            returnValue: _i4.Future<int>.value(0),
+          )
+          as _i4.Future<int>);
+
+  @override
+  _i4.Future<void> eraseEverything(_i3.BookmarkRoot? root) =>
       (super.noSuchMethod(
             Invocation.method(#eraseEverything, [root]),
-            returnValue: _i3.Future<void>.value(),
+            returnValue: _i4.Future<void>.value(),
-            returnValueForMissingStub: _i3.Future<void>.value(),
+            returnValueForMissingStub: _i4.Future<void>.value(),
           )
-          as _i3.Future<void>);
+          as _i4.Future<void>);
 }

apps/weblibre/test/features/geckoview/features/tabs/data/models/container_data_test.dart

@@ -66,10 +66,7 @@ void main() {
     });
 
     test('defaults to false', () {
-      expect(
+      expect(ContainerMetadata.withDefaults().isolatedAppLinkSettings, isFalse);
-        ContainerMetadata.withDefaults().isolatedAppLinkSettings,
-        isFalse,
-      );
     });
   });
 

packages/flutter_mozilla_components/android/src/main/kotlin/eu/weblibre/flutter_mozilla_components/api/GeckoBookmarksApiImpl.kt

@@ -2,7 +2,9 @@ package eu.weblibre.flutter_mozilla_components.api
 
 import eu.weblibre.flutter_mozilla_components.GlobalComponents
 import eu.weblibre.flutter_mozilla_components.feature.GeckoBookmarksExtensionBridge
+import eu.weblibre.flutter_mozilla_components.pigeons.BookmarkImportNode
 import eu.weblibre.flutter_mozilla_components.pigeons.BookmarkInfo
+import eu.weblibre.flutter_mozilla_components.pigeons.BookmarkInsertTreeResult
 import eu.weblibre.flutter_mozilla_components.pigeons.BookmarkNode
 import eu.weblibre.flutter_mozilla_components.pigeons.BookmarkNodeType
 import eu.weblibre.flutter_mozilla_components.pigeons.GeckoBookmarksApi
@@ -11,10 +13,19 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
+import mozilla.components.concept.storage.BookmarkInfo as MozillaBookmarkInfo
+import mozilla.components.concept.storage.bookmarks.InsertableBookmarkTreeNode
+import mozilla.components.concept.storage.bookmarks.InsertableBookmarkTreeRoot
 
 class GeckoBookmarksApiImpl() : GeckoBookmarksApi {
     companion object {
         private val coroutineScope = CoroutineScope(Dispatchers.Main + SupervisorJob())
+
+        /**
+         * Name of the short-lived folder that loose top-level nodes pass through
+         * during an import. Only visible if an import is interrupted partway.
+         */
+        private const val SCRATCH_FOLDER_TITLE = "Importing bookmarks…"
     }
 
     private val components by lazy {
@@ -231,6 +242,261 @@ class GeckoBookmarksApiImpl() : GeckoBookmarksApi {
         }
     }
 
+    override fun insertTree(
+        parentGuid: String,
+        children: List<BookmarkImportNode>,
+        callback: (Result<BookmarkInsertTreeResult>) -> Unit
+    ) {
+        coroutineScope.launch {
+            // Imports can carry tens of thousands of nodes, so the whole batch runs
+            // off the main thread. Only the callback returns to it, because Pigeon
+            // replies must be delivered on the platform thread.
+            val result = withContext(Dispatchers.IO) {
+                runCatching { insertImportNodes(parentGuid, children) }
+            }
+            callback(result)
+        }
+    }
+
+    /**
+     * Appends [nodes] underneath [parentGuid], handing every top-level folder to
+     * storage as a single tree insertion.
+     *
+     * `insertTree` is the only storage call that carries timestamps, and it can
+     * only create a *folder*. Loose top-level items and separators would
+     * therefore lose their `ADD_DATE` if inserted with `addItem`/`addSeparator`,
+     * which have no timestamp parameters — so they are staged inside a scratch
+     * folder and reparented instead. See [stageLooseNodes].
+     *
+     * A failing top-level node is counted and skipped rather than aborting the
+     * whole import, matching the per-node importer this replaced. Deliberately
+     * does not emit `bookmarks.onCreated`: one event per imported node would
+     * flood every installed WebExtension.
+     */
+    private suspend fun insertImportNodes(
+        parentGuid: String,
+        nodes: List<BookmarkImportNode>
+    ): BookmarkInsertTreeResult {
+        val storage = components.core.bookmarksStorage
+        var insertedItemCount = 0L
+        var failedNodeCount = 0L
+
+        val staged = stageLooseNodes(parentGuid, nodes)
+
+        for (node in nodes) {
+            // Every branch appends (position = null). Walking the nodes in order
+            // therefore reproduces the file's order, and merging into a folder
+            // that already has children leaves those in place.
+            val outcome: Result<Long> = when (node.type) {
+                BookmarkNodeType.FOLDER -> {
+                    val folder = node.toInsertableFolder(position = null)
+                    storage.insertTree(InsertableBookmarkTreeRoot(parentGuid, folder))
+                        .map { folder.itemCount() }
+                }
+
+                // Already written by stageLooseNodes; only the move is left.
+                else -> staged.reparent(node, parentGuid)
+            }
+
+            outcome.fold(
+                { count -> insertedItemCount += count },
+                { failedNodeCount += 1 }
+            )
+        }
+
+        staged.discardScratchFolder()
+
+        return BookmarkInsertTreeResult(insertedItemCount, failedNodeCount)
+    }
+
+    override fun countBookmarksInTrees(
+        guids: List<String>,
+        callback: (Result<Long>) -> Unit
+    ) {
+        coroutineScope.launch {
+            val result = withContext(Dispatchers.IO) {
+                runCatching {
+                    components.core.bookmarksStorage.countBookmarksInTrees(guids).toLong()
+                }
+            }
+            callback(result)
+        }
+    }
+
+    /**
+     * Loose top-level nodes written into a scratch folder, waiting to be moved
+     * to their real parent.
+     *
+     * The scratch folder is created under the import destination and holds the
+     * loose nodes in file order; [reparent] hands them out one at a time as the
+     * caller walks the top level, and [discardScratchFolder] removes the folder
+     * once it has been emptied.
+     */
+    private inner class StagedLooseNodes(
+        private val scratchGuid: String?,
+        /** The loose nodes that made it into the scratch folder, in order. */
+        private val staged: List<BookmarkImportNode>,
+        /** Guid assigned to each entry of [staged], by index. */
+        private val guids: List<String>,
+        private val failure: Throwable?
+    ) {
+        private var next = 0
+
+        /**
+         * Moves the next staged node under [parentGuid].
+         *
+         * Reparenting preserves `dateAdded`, which is what bookmark ordering and
+         * "recently added" depend on. It does refresh `lastModified` — the pair
+         * cannot both survive, because the only storage call that accepts
+         * timestamps creates a folder.
+         */
+        suspend fun reparent(node: BookmarkImportNode, parentGuid: String): Result<Long> {
+            failure?.let { return Result.failure(it) }
+
+            // Nodes dropped while converting (an item with no usable url) were
+            // never staged, so the cursor must not advance past them.
+            if (staged.getOrNull(next) !== node) {
+                return Result.failure(
+                    IllegalArgumentException("Unusable bookmark node of type ${node.type}")
+                )
+            }
+
+            val guid = guids.getOrNull(next)
+                ?: return Result.failure(
+                    IllegalStateException("Storage did not report a guid for ${node.type}")
+                )
+            next++
+
+            // A null field means "leave unchanged"; appending (null position)
+            // keeps the file's order as the caller walks the top level.
+            val move = MozillaBookmarkInfo(
+                parentGuid = parentGuid,
+                position = null,
+                title = null,
+                url = null
+            )
+
+            return components.core.bookmarksStorage
+                .updateNode(guid, move)
+                .map { if (node.type == BookmarkNodeType.ITEM) 1L else 0L }
+        }
+
+        /**
+         * Deletes the scratch folder, but only once it is empty.
+         *
+         * Deleting cascades to children, so anything that failed to move is left
+         * behind in a visible folder rather than being silently destroyed.
+         */
+        suspend fun discardScratchFolder() {
+            val guid = scratchGuid ?: return
+            val storage = components.core.bookmarksStorage
+
+            val remaining = storage.getTree(guid, false).getOrNull()?.children
+            if (remaining.isNullOrEmpty()) {
+                storage.deleteNode(guid)
+            }
+        }
+    }
+
+    /**
+     * Writes every loose top-level node of [nodes] into a scratch folder under
+     * [parentGuid] in a single tree insertion, so their timestamps survive.
+     *
+     * Returns an empty staging area when the import has no loose top-level
+     * nodes, which is the common case for Firefox exports and costs nothing.
+     */
+    private suspend fun stageLooseNodes(
+        parentGuid: String,
+        nodes: List<BookmarkImportNode>
+    ): StagedLooseNodes {
+        val empty = StagedLooseNodes(null, emptyList(), emptyList(), null)
+
+        val staged = ArrayList<BookmarkImportNode>()
+        val insertable = ArrayList<InsertableBookmarkTreeNode>()
+        for (node in nodes) {
+            if (node.type == BookmarkNodeType.FOLDER) continue
+            val converted = node.toInsertableNode(insertable.size.toUInt()) ?: continue
+            insertable.add(converted)
+            staged.add(node)
+        }
+
+        if (staged.isEmpty()) return empty
+
+        val scratch = InsertableBookmarkTreeNode.Folder(
+            title = SCRATCH_FOLDER_TITLE,
+            dateAddedTimestamp = 0L,
+            lastModifiedTimestamp = 0L,
+            position = null,
+            children = insertable
+        )
+
+        val storage = components.core.bookmarksStorage
+
+        return storage.insertTree(InsertableBookmarkTreeRoot(parentGuid, scratch)).fold(
+            { scratchGuid ->
+                // Read the assigned guids back in position order, which is the
+                // order the nodes were handed to insertTree.
+                val children = storage.getTree(scratchGuid, false).getOrNull()?.children
+                StagedLooseNodes(
+                    scratchGuid = scratchGuid,
+                    staged = staged,
+                    guids = children.orEmpty().map { it.guid },
+                    failure = null
+                )
+            },
+            { error -> StagedLooseNodes(null, staged, emptyList(), error) }
+        )
+    }
+
+    private fun BookmarkImportNode.toInsertableFolder(position: UInt?) =
+        InsertableBookmarkTreeNode.Folder(
+            title = this.title,
+            dateAddedTimestamp = this.dateAdded,
+            lastModifiedTimestamp = this.lastModified,
+            position = position,
+            children = this.children.toInsertableNodes()
+        )
+
+    /**
+     * Converts children to their insertable form, dropping unusable nodes and
+     * assigning positions from the surviving order so no gaps are left behind.
+     */
+    private fun List<BookmarkImportNode>.toInsertableNodes(): List<InsertableBookmarkTreeNode> {
+        val converted = ArrayList<InsertableBookmarkTreeNode>(this.size)
+        for (node in this) {
+            converted.add(node.toInsertableNode(converted.size.toUInt()) ?: continue)
+        }
+        return converted
+    }
+
+    private fun BookmarkImportNode.toInsertableNode(position: UInt): InsertableBookmarkTreeNode? =
+        when (this.type) {
+            BookmarkNodeType.FOLDER -> this.toInsertableFolder(position)
+
+            BookmarkNodeType.ITEM -> this.url?.takeIf { it.isNotEmpty() }?.let { url ->
+                InsertableBookmarkTreeNode.Item(
+                    title = this.title,
+                    url = url,
+                    dateAddedTimestamp = this.dateAdded,
+                    lastModifiedTimestamp = this.lastModified,
+                    position = position
+                )
+            }
+
+            BookmarkNodeType.SEPARATOR -> InsertableBookmarkTreeNode.Separator(
+                dateAddedTimestamp = this.dateAdded,
+                lastModifiedTimestamp = this.lastModified,
+                position = position
+            )
+        }
+
+    /** Number of bookmark items in this subtree, excluding folders and separators. */
+    private fun InsertableBookmarkTreeNode.itemCount(): Long = when (this) {
+        is InsertableBookmarkTreeNode.Item -> 1L
+        is InsertableBookmarkTreeNode.Folder -> this.children.sumOf { it.itemCount() }
+        is InsertableBookmarkTreeNode.Separator -> 0L
+    }
+
     /**
      * Notifies extension `bookmarks.onCreated` listeners about a node created
      * through the app UI, so extensions (e.g. floccus) observe app-side edits to

packages/flutter_mozilla_components/android/src/main/kotlin/eu/weblibre/flutter_mozilla_components/pigeons/Gecko.g.kt

@@ -5271,6 +5271,127 @@ data class BookmarkNode (
   }
 }
 
+/**
+ * A node of a bookmark tree that is about to be bulk-inserted into storage.
+ *
+ * Unlike [BookmarkNode] this carries no guids or parent links: the tree is
+ * described purely by nesting, and storage assigns guids while inserting.
+ *
+ * @property type Whether this node is an item, a folder or a separator.
+ * @property title The title of the item or folder. Ignored for separators.
+ * @property url The URL of the item. Must be non-null for items, ignored otherwise.
+ * @property dateAdded Creation timestamp in milliseconds since epoch, or 0 if unknown.
+ * @property lastModified Modification timestamp in milliseconds since epoch, or 0 if unknown.
+ * @property children Child nodes of a folder, in insertion order. Empty for items and separators.
+ *
+ * Generated class from Pigeon that represents data sent in messages.
+ */
+data class BookmarkImportNode (
+  val type: BookmarkNodeType,
+  val title: String? = null,
+  val url: String? = null,
+  val dateAdded: Long,
+  val lastModified: Long,
+  val children: List<BookmarkImportNode>
+)
+ {
+  companion object {
+    fun fromList(pigeonVar_list: List<Any?>): BookmarkImportNode {
+      val type = pigeonVar_list[0] as BookmarkNodeType
+      val title = pigeonVar_list[1] as String?
+      val url = pigeonVar_list[2] as String?
+      val dateAdded = pigeonVar_list[3] as Long
+      val lastModified = pigeonVar_list[4] as Long
+      val children = pigeonVar_list[5] as List<BookmarkImportNode>
+      return BookmarkImportNode(type, title, url, dateAdded, lastModified, children)
+    }
+  }
+  fun toList(): List<Any?> {
+    return listOf(
+      type,
+      title,
+      url,
+      dateAdded,
+      lastModified,
+      children,
+    )
+  }
+  override fun equals(other: Any?): Boolean {
+    if (other == null || other.javaClass != javaClass) {
+      return false
+    }
+    if (this === other) {
+      return true
+    }
+    val other = other as BookmarkImportNode
+    return GeckoPigeonUtils.deepEquals(this.type, other.type) && GeckoPigeonUtils.deepEquals(this.title, other.title) && GeckoPigeonUtils.deepEquals(this.url, other.url) && GeckoPigeonUtils.deepEquals(this.dateAdded, other.dateAdded) && GeckoPigeonUtils.deepEquals(this.lastModified, other.lastModified) && GeckoPigeonUtils.deepEquals(this.children, other.children)
+  }
+
+  override fun hashCode(): Int {
+    var result = javaClass.hashCode()
+    result = 31 * result + GeckoPigeonUtils.deepHash(this.type)
+    result = 31 * result + GeckoPigeonUtils.deepHash(this.title)
+    result = 31 * result + GeckoPigeonUtils.deepHash(this.url)
+    result = 31 * result + GeckoPigeonUtils.deepHash(this.dateAdded)
+    result = 31 * result + GeckoPigeonUtils.deepHash(this.lastModified)
+    result = 31 * result + GeckoPigeonUtils.deepHash(this.children)
+    return result
+  }
+  override fun toString(): String {
+    return "BookmarkImportNode(type=$type, title=$title, url=$url, dateAdded=$dateAdded, lastModified=$lastModified, children=$children)"
+  }
+}
+
+/**
+ * Outcome of a bulk bookmark tree insertion.
+ *
+ * @property insertedItemCount The number of bookmark items (not folders or
+ * separators) that were inserted.
+ * @property failedNodeCount The number of top-level nodes that could not be
+ * inserted. Their subtrees are missing entirely.
+ *
+ * Generated class from Pigeon that represents data sent in messages.
+ */
+data class BookmarkInsertTreeResult (
+  val insertedItemCount: Long,
+  val failedNodeCount: Long
+)
+ {
+  companion object {
+    fun fromList(pigeonVar_list: List<Any?>): BookmarkInsertTreeResult {
+      val insertedItemCount = pigeonVar_list[0] as Long
+      val failedNodeCount = pigeonVar_list[1] as Long
+      return BookmarkInsertTreeResult(insertedItemCount, failedNodeCount)
+    }
+  }
+  fun toList(): List<Any?> {
+    return listOf(
+      insertedItemCount,
+      failedNodeCount,
+    )
+  }
+  override fun equals(other: Any?): Boolean {
+    if (other == null || other.javaClass != javaClass) {
+      return false
+    }
+    if (this === other) {
+      return true
+    }
+    val other = other as BookmarkInsertTreeResult
+    return GeckoPigeonUtils.deepEquals(this.insertedItemCount, other.insertedItemCount) && GeckoPigeonUtils.deepEquals(this.failedNodeCount, other.failedNodeCount)
+  }
+
+  override fun hashCode(): Int {
+    var result = javaClass.hashCode()
+    result = 31 * result + GeckoPigeonUtils.deepHash(this.insertedItemCount)
+    result = 31 * result + GeckoPigeonUtils.deepHash(this.failedNodeCount)
+    return result
+  }
+  override fun toString(): String {
+    return "BookmarkInsertTreeResult(insertedItemCount=$insertedItemCount, failedNodeCount=$failedNodeCount)"
+  }
+}
+
 /**
  * Class for making alterations to any bookmark node
  *
@@ -6613,28 +6734,32 @@ private data class GeckoPigeonInternalCodecOverflow (
         
     when (type.toInt()) {
       0 ->
-        return AppLinkResolutionResult.fromList(wrapped as List<Any?>)
+        return AppLinkPolicySnapshot.fromList(wrapped as List<Any?>)
       1 ->
-        return PwaIcon.fromList(wrapped as List<Any?>)
+        return AppLinkPromptRequest.fromList(wrapped as List<Any?>)
       2 ->
-        return ShareTargetFiles.fromList(wrapped as List<Any?>)
+        return AppLinkResolutionResult.fromList(wrapped as List<Any?>)
       3 ->
-        return ShareTargetParams.fromList(wrapped as List<Any?>)
+        return PwaIcon.fromList(wrapped as List<Any?>)
       4 ->
-        return ShareTarget.fromList(wrapped as List<Any?>)
+        return ShareTargetFiles.fromList(wrapped as List<Any?>)
       5 ->
-        return ExternalApplicationResource.fromList(wrapped as List<Any?>)
+        return ShareTargetParams.fromList(wrapped as List<Any?>)
       6 ->
-        return PwaManifest.fromList(wrapped as List<Any?>)
+        return ShareTarget.fromList(wrapped as List<Any?>)
       7 ->
-        return SandboxCaptureEntry.fromList(wrapped as List<Any?>)
+        return ExternalApplicationResource.fromList(wrapped as List<Any?>)
       8 ->
-        return GestureConfig.fromList(wrapped as List<Any?>)
+        return PwaManifest.fromList(wrapped as List<Any?>)
       9 ->
-        return PushDistributor.fromList(wrapped as List<Any?>)
+        return SandboxCaptureEntry.fromList(wrapped as List<Any?>)
       10 ->
-        return PushStatus.fromList(wrapped as List<Any?>)
+        return GestureConfig.fromList(wrapped as List<Any?>)
       11 ->
+        return PushDistributor.fromList(wrapped as List<Any?>)
+      12 ->
+        return PushStatus.fromList(wrapped as List<Any?>)
+      13 ->
         return PushSubscription.fromList(wrapped as List<Any?>)
     }
     return null
@@ -7230,47 +7355,47 @@ private open class GeckoPigeonCodec : StandardMessageCodec() {
       }
       246.toByte() -> {
         return (readValue(buffer) as? List<Any?>)?.let {
-          BookmarkInfo.fromList(it)
+          BookmarkImportNode.fromList(it)
         }
       }
       247.toByte() -> {
         return (readValue(buffer) as? List<Any?>)?.let {
-          SitePermissions.fromList(it)
+          BookmarkInsertTreeResult.fromList(it)
         }
       }
       248.toByte() -> {
         return (readValue(buffer) as? List<Any?>)?.let {
-          TrackingProtectionException.fromList(it)
+          BookmarkInfo.fromList(it)
         }
       }
       249.toByte() -> {
         return (readValue(buffer) as? List<Any?>)?.let {
-          AppLinkTarget.fromList(it)
+          SitePermissions.fromList(it)
         }
       }
       250.toByte() -> {
         return (readValue(buffer) as? List<Any?>)?.let {
-          ProtectedTargetPattern.fromList(it)
+          TrackingProtectionException.fromList(it)
         }
       }
       251.toByte() -> {
         return (readValue(buffer) as? List<Any?>)?.let {
-          NativeAppLinkRule.fromList(it)
+          AppLinkTarget.fromList(it)
         }
       }
       252.toByte() -> {
         return (readValue(buffer) as? List<Any?>)?.let {
-          NativeContextAppLinkPolicy.fromList(it)
+          ProtectedTargetPattern.fromList(it)
         }
       }
       253.toByte() -> {
         return (readValue(buffer) as? List<Any?>)?.let {
-          AppLinkPolicySnapshot.fromList(it)
+          NativeAppLinkRule.fromList(it)
         }
       }
       254.toByte() -> {
         return (readValue(buffer) as? List<Any?>)?.let {
-          AppLinkPromptRequest.fromList(it)
+          NativeContextAppLinkPolicy.fromList(it)
         }
       }
       255.toByte() -> {
@@ -7751,102 +7876,112 @@ private open class GeckoPigeonCodec : StandardMessageCodec() {
         stream.write(245)
         writeValue(stream, value.toList())
       }
-      is BookmarkInfo -> {
+      is BookmarkImportNode -> {
         stream.write(246)
         writeValue(stream, value.toList())
       }
-      is SitePermissions -> {
+      is BookmarkInsertTreeResult -> {
         stream.write(247)
         writeValue(stream, value.toList())
       }
-      is TrackingProtectionException -> {
+      is BookmarkInfo -> {
         stream.write(248)
         writeValue(stream, value.toList())
       }
-      is AppLinkTarget -> {
+      is SitePermissions -> {
         stream.write(249)
         writeValue(stream, value.toList())
       }
-      is ProtectedTargetPattern -> {
+      is TrackingProtectionException -> {
         stream.write(250)
         writeValue(stream, value.toList())
       }
-      is NativeAppLinkRule -> {
+      is AppLinkTarget -> {
         stream.write(251)
         writeValue(stream, value.toList())
       }
-      is NativeContextAppLinkPolicy -> {
+      is ProtectedTargetPattern -> {
         stream.write(252)
         writeValue(stream, value.toList())
       }
-      is AppLinkPolicySnapshot -> {
+      is NativeAppLinkRule -> {
         stream.write(253)
         writeValue(stream, value.toList())
       }
-      is AppLinkPromptRequest -> {
+      is NativeContextAppLinkPolicy -> {
         stream.write(254)
         writeValue(stream, value.toList())
       }
-      is AppLinkResolutionResult -> {
+      is AppLinkPolicySnapshot -> {
         val wrap = GeckoPigeonInternalCodecOverflow(type = 0, wrapped = value.toList())
         stream.write(255)
         writeValue(stream, wrap.toList())
       }
-      is PwaIcon -> {
+      is AppLinkPromptRequest -> {
         val wrap = GeckoPigeonInternalCodecOverflow(type = 1, wrapped = value.toList())
         stream.write(255)
         writeValue(stream, wrap.toList())
       }
-      is ShareTargetFiles -> {
+      is AppLinkResolutionResult -> {
         val wrap = GeckoPigeonInternalCodecOverflow(type = 2, wrapped = value.toList())
         stream.write(255)
         writeValue(stream, wrap.toList())
       }
-      is ShareTargetParams -> {
+      is PwaIcon -> {
         val wrap = GeckoPigeonInternalCodecOverflow(type = 3, wrapped = value.toList())
         stream.write(255)
         writeValue(stream, wrap.toList())
       }
-      is ShareTarget -> {
+      is ShareTargetFiles -> {
         val wrap = GeckoPigeonInternalCodecOverflow(type = 4, wrapped = value.toList())
         stream.write(255)
         writeValue(stream, wrap.toList())
       }
-      is ExternalApplicationResource -> {
+      is ShareTargetParams -> {
         val wrap = GeckoPigeonInternalCodecOverflow(type = 5, wrapped = value.toList())
         stream.write(255)
         writeValue(stream, wrap.toList())
       }
-      is PwaManifest -> {
+      is ShareTarget -> {
         val wrap = GeckoPigeonInternalCodecOverflow(type = 6, wrapped = value.toList())
         stream.write(255)
         writeValue(stream, wrap.toList())
       }
-      is SandboxCaptureEntry -> {
+      is ExternalApplicationResource -> {
         val wrap = GeckoPigeonInternalCodecOverflow(type = 7, wrapped = value.toList())
         stream.write(255)
         writeValue(stream, wrap.toList())
       }
-      is GestureConfig -> {
+      is PwaManifest -> {
         val wrap = GeckoPigeonInternalCodecOverflow(type = 8, wrapped = value.toList())
         stream.write(255)
         writeValue(stream, wrap.toList())
       }
-      is PushDistributor -> {
+      is SandboxCaptureEntry -> {
         val wrap = GeckoPigeonInternalCodecOverflow(type = 9, wrapped = value.toList())
         stream.write(255)
         writeValue(stream, wrap.toList())
       }
-      is PushStatus -> {
+      is GestureConfig -> {
         val wrap = GeckoPigeonInternalCodecOverflow(type = 10, wrapped = value.toList())
         stream.write(255)
         writeValue(stream, wrap.toList())
       }
-      is PushSubscription -> {
+      is PushDistributor -> {
         val wrap = GeckoPigeonInternalCodecOverflow(type = 11, wrapped = value.toList())
         stream.write(255)
         writeValue(stream, wrap.toList())
       }
+      is PushStatus -> {
+        val wrap = GeckoPigeonInternalCodecOverflow(type = 12, wrapped = value.toList())
+        stream.write(255)
+        writeValue(stream, wrap.toList())
+      }
+      is PushSubscription -> {
+        val wrap = GeckoPigeonInternalCodecOverflow(type = 13, wrapped = value.toList())
+        stream.write(255)
+        writeValue(stream, wrap.toList())
+      }
       else -> super.writeValue(stream, value)
     }
   }
@@ -12253,6 +12388,42 @@ interface GeckoBookmarksApi {
    * @return Whether the bookmark existed or not.
    */
   fun deleteNode(guid: String, callback: (Result<Boolean>) -> Unit)
+  /**
+   * Bulk-inserts [children] underneath [parentGuid], appending them after any
+   * nodes the parent already contains.
+   *
+   * Each top-level folder is handed to the storage layer as a single tree
+   * insertion, so importing a large bookmark file costs one platform channel
+   * call instead of one per node. Separators are preserved.
+   *
+   * Timestamps survive in full for everything nested inside a top-level
+   * folder. Loose top-level items and separators keep their [dateAdded], but
+   * their [lastModified] is set to the time of import: the only storage call
+   * that accepts timestamps creates a folder, so nodes landing directly in
+   * [parentGuid] have to be moved into place afterwards.
+   *
+   * Sync behavior: will add the inserted bookmarks to remote devices.
+   *
+   * Unlike [addItem] and [addFolder] this does *not* emit a
+   * `bookmarks.onCreated` extension event per node, since a large import would
+   * otherwise flood every installed WebExtension.
+   *
+   * @param parentGuid The guid of the existing folder to insert underneath.
+   * @param children The nodes to insert, in the order they should appear.
+   * @return The number of inserted bookmark items and failed top-level nodes.
+   */
+  fun insertTree(parentGuid: String, children: List<BookmarkImportNode>, callback: (Result<BookmarkInsertTreeResult>) -> Unit)
+  /**
+   * Counts the bookmark items contained in the trees rooted at [guids].
+   *
+   * Folders and separators are not counted, and a guid that does not exist
+   * contributes nothing. Lets the app report how much a destructive action
+   * affects without loading the subtrees into Dart.
+   *
+   * @param guids The guids of the folders to count within.
+   * @return The total number of bookmark items across all trees.
+   */
+  fun countBookmarksInTrees(guids: List<String>, callback: (Result<Long>) -> Unit)
 
   companion object {
     /** The codec used by GeckoBookmarksApi. */
@@ -12452,6 +12623,47 @@ interface GeckoBookmarksApi {
           channel.setMessageHandler(null)
         }
       }
+      run {
+        val channel = BasicMessageChannel<Any?>(binaryMessenger, "dev.flutter.pigeon.flutter_mozilla_components.GeckoBookmarksApi.insertTree$separatedMessageChannelSuffix", codec)
+        if (api != null) {
+          channel.setMessageHandler { message, reply ->
+            val args = message as List<Any?>
+            val parentGuidArg = args[0] as String
+            val childrenArg = args[1] as List<BookmarkImportNode>
+            api.insertTree(parentGuidArg, childrenArg) { result: Result<BookmarkInsertTreeResult> ->
+              val error = result.exceptionOrNull()
+              if (error != null) {
+                reply.reply(GeckoPigeonUtils.wrapError(error))
+              } else {
+                val data = result.getOrNull()
+                reply.reply(GeckoPigeonUtils.wrapResult(data))
+              }
+            }
+          }
+        } else {
+          channel.setMessageHandler(null)
+        }
+      }
+      run {
+        val channel = BasicMessageChannel<Any?>(binaryMessenger, "dev.flutter.pigeon.flutter_mozilla_components.GeckoBookmarksApi.countBookmarksInTrees$separatedMessageChannelSuffix", codec)
+        if (api != null) {
+          channel.setMessageHandler { message, reply ->
+            val args = message as List<Any?>
+            val guidsArg = args[0] as List<String>
+            api.countBookmarksInTrees(guidsArg) { result: Result<Long> ->
+              val error = result.exceptionOrNull()
+              if (error != null) {
+                reply.reply(GeckoPigeonUtils.wrapError(error))
+              } else {
+                val data = result.getOrNull()
+                reply.reply(GeckoPigeonUtils.wrapResult(data))
+              }
+            }
+          }
+        } else {
+          channel.setMessageHandler(null)
+        }
+      }
     }
   }
 }

packages/flutter_mozilla_components/lib/flutter_mozilla_components.dart

@@ -59,7 +59,9 @@ export 'src/pigeons/gecko.g.dart'
         AppLinksMode,
         AudioHitResult,
         AutoplayStatus,
+        BookmarkImportNode,
         BookmarkInfo,
+        BookmarkInsertTreeResult,
         BookmarkNode,
         BookmarkNodeType,
         BounceTrackingProtectionMode,

packages/flutter_mozilla_components/lib/src/domain/services/gecko_bookmarks.dart

@@ -129,6 +129,42 @@ class GeckoBookmarksService {
     return _api.deleteNode(guid);
   }
 
+  /// Bulk-inserts [children] underneath [parentGuid], appending them after any
+  /// nodes the parent already contains.
+  ///
+  /// Prefer this over looping [addItem]/[addFolder] when inserting a whole
+  /// tree: the entire batch crosses the platform channel once and each
+  /// top-level folder is written as a single storage operation. Separators are
+  /// preserved, and no per-node `bookmarks.onCreated` extension events are
+  /// emitted.
+  ///
+  /// Timestamps survive in full for everything nested inside a top-level
+  /// folder. Loose top-level items and separators keep their `dateAdded` but
+  /// get a fresh `lastModified`, because the only storage call that accepts
+  /// timestamps creates a folder.
+  ///
+  /// @param parentGuid The guid of the existing folder to insert underneath.
+  /// @param children The nodes to insert, in the order they should appear.
+  /// @return The number of inserted bookmark items and failed top-level nodes.
+  Future<BookmarkInsertTreeResult> insertTree(
+    String parentGuid,
+    List<BookmarkImportNode> children,
+  ) {
+    return _api.insertTree(parentGuid, children);
+  }
+
+  /// Counts the bookmark items contained in the trees rooted at [guids].
+  ///
+  /// Folders and separators are not counted. Prefer this over walking a
+  /// [getTree] result: the count is computed in storage, so no subtree has to
+  /// be materialised in Dart.
+  ///
+  /// @param guids The guids of the folders to count within.
+  /// @return The total number of bookmark items across all trees.
+  Future<int> countBookmarksInTrees(List<String> guids) {
+    return _api.countBookmarksInTrees(guids);
+  }
+
   /// Removes ALL bookmarks from the specified root folder.
   /// The root folder itself is preserved, only its children are removed.
   Future<void> eraseEverything(BookmarkRoot root) async {

packages/flutter_mozilla_components/pigeons/gecko.dart

@@ -2467,6 +2467,51 @@ class BookmarkNode {
   });
 }
 
+/// A node of a bookmark tree that is about to be bulk-inserted into storage.
+///
+/// Unlike [BookmarkNode] this carries no guids or parent links: the tree is
+/// described purely by nesting, and storage assigns guids while inserting.
+///
+/// @property type Whether this node is an item, a folder or a separator.
+/// @property title The title of the item or folder. Ignored for separators.
+/// @property url The URL of the item. Must be non-null for items, ignored otherwise.
+/// @property dateAdded Creation timestamp in milliseconds since epoch, or 0 if unknown.
+/// @property lastModified Modification timestamp in milliseconds since epoch, or 0 if unknown.
+/// @property children Child nodes of a folder, in insertion order. Empty for items and separators.
+class BookmarkImportNode {
+  final BookmarkNodeType type;
+  final String? title;
+  final String? url;
+  final int dateAdded;
+  final int lastModified;
+  final List<BookmarkImportNode> children;
+
+  BookmarkImportNode({
+    required this.type,
+    required this.title,
+    required this.url,
+    required this.dateAdded,
+    required this.lastModified,
+    required this.children,
+  });
+}
+
+/// Outcome of a bulk bookmark tree insertion.
+///
+/// @property insertedItemCount The number of bookmark items (not folders or
+/// separators) that were inserted.
+/// @property failedNodeCount The number of top-level nodes that could not be
+/// inserted. Their subtrees are missing entirely.
+class BookmarkInsertTreeResult {
+  final int insertedItemCount;
+  final int failedNodeCount;
+
+  BookmarkInsertTreeResult({
+    required this.insertedItemCount,
+    required this.failedNodeCount,
+  });
+}
+
 /// Class for making alterations to any bookmark node
 class BookmarkInfo {
   final String? parentGuid;
@@ -2639,6 +2684,45 @@ abstract class GeckoBookmarksApi {
   /// @return Whether the bookmark existed or not.
   @async
   bool deleteNode(String guid);
+
+  /// Bulk-inserts [children] underneath [parentGuid], appending them after any
+  /// nodes the parent already contains.
+  ///
+  /// Each top-level folder is handed to the storage layer as a single tree
+  /// insertion, so importing a large bookmark file costs one platform channel
+  /// call instead of one per node. Separators are preserved.
+  ///
+  /// Timestamps survive in full for everything nested inside a top-level
+  /// folder. Loose top-level items and separators keep their [dateAdded], but
+  /// their [lastModified] is set to the time of import: the only storage call
+  /// that accepts timestamps creates a folder, so nodes landing directly in
+  /// [parentGuid] have to be moved into place afterwards.
+  ///
+  /// Sync behavior: will add the inserted bookmarks to remote devices.
+  ///
+  /// Unlike [addItem] and [addFolder] this does *not* emit a
+  /// `bookmarks.onCreated` extension event per node, since a large import would
+  /// otherwise flood every installed WebExtension.
+  ///
+  /// @param parentGuid The guid of the existing folder to insert underneath.
+  /// @param children The nodes to insert, in the order they should appear.
+  /// @return The number of inserted bookmark items and failed top-level nodes.
+  @async
+  BookmarkInsertTreeResult insertTree(
+    String parentGuid,
+    List<BookmarkImportNode> children,
+  );
+
+  /// Counts the bookmark items contained in the trees rooted at [guids].
+  ///
+  /// Folders and separators are not counted, and a guid that does not exist
+  /// contributes nothing. Lets the app report how much a destructive action
+  /// affects without loading the subtrees into Dart.
+  ///
+  /// @param guids The guids of the folders to count within.
+  /// @return The total number of bookmark items across all trees.
+  @async
+  int countBookmarksInTrees(List<String> guids);
 }
 
 // =============================================================================

pubspec.lock

@@ -25,14 +25,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.3.3"
-  animated_tree_view:
-    dependency: transitive
-    description:
-      name: animated_tree_view
-      sha256: ed982be7fa2cf51b62bb76e95b6a0f423cde12f1da8745a1da938e82a7baacf2
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.3.0"
   ansi_styles:
     dependency: transitive
     description:
@@ -361,14 +353,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "8.1.0"
-  diffutil_dart:
-    dependency: transitive
-    description:
-      name: diffutil_dart
-      sha256: "5e74883aedf87f3b703cb85e815bdc1ed9208b33501556e4a8a5572af9845c81"
-      url: "https://pub.dev"
-    source: hosted
-    version: "4.0.1"
   drift:
     dependency: transitive
     description:
@@ -1481,14 +1465,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.1.0"
-  scroll_to_index:
-    dependency: transitive
-    description:
-      name: scroll_to_index
-      sha256: b707546e7500d9f070d63e5acf74fd437ec7eeeb68d3412ef7b0afada0b4f176
-      url: "https://pub.dev"
-    source: hosted
-    version: "3.0.1"
   search_client:
     dependency: transitive
     description: