improve container color selector

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

@@ -41,7 +41,7 @@ final class TabRepositoryProvider
   }
 }
 
-String _$tabRepositoryHash() => r'7d41038ac5a20ecf6de0645b99231fb8b2f6963a';
+String _$tabRepositoryHash() => r'd7b67460388c264f477325266a3299fe6df2df07';
 
 abstract class _$TabRepository extends $Notifier<void> {
   void build();

apps/weblibre/lib/features/geckoview/features/browser/presentation/widgets/browser_home.dart

@@ -248,7 +248,11 @@ class _ContainerHeader extends StatelessWidget {
   Widget build(BuildContext context) {
     final colorScheme = Theme.of(context).colorScheme;
     final containerColor = container.color;
-    final containerPalette = ContainerColors.palette(context, containerColor);
+    final containerPalette = ContainerColors.palette(
+      context,
+      containerColor,
+      useCustomColor: container.metadata.useCustomColor,
+    );
 
     return Container(
       width: 112,

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

@@ -40,9 +40,14 @@ import 'package:weblibre/features/web_search/domain/controllers/sandbox_capture_
 import 'package:weblibre/presentation/widgets/uri_breadcrumb.dart';
 
 class CompactAppBarTitle extends ConsumerWidget {
-  const CompactAppBarTitle({super.key, this.containerColor});
+  const CompactAppBarTitle({
+    super.key,
+    this.containerColor,
+    this.useCustomColor = false,
+  });
 
   final Color? containerColor;
+  final bool useCustomColor;
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
@@ -77,6 +82,7 @@ class CompactAppBarTitle extends ConsumerWidget {
       siteSettingsBadgeState: siteSettingsBadgeState,
       longPressUrlCopy: settings.tabBarLongPressUrlCopy,
       containerColor: containerColor,
+      useCustomColor: useCustomColor,
       sandboxSourceUri: sandboxSourceUri,
       onSiteSettingsTap: () {
         ref
@@ -105,6 +111,7 @@ class CompactAppBarTitleView extends StatelessWidget {
     this.tabIcon,
     this.longPressUrlCopy = true,
     this.containerColor,
+    this.useCustomColor = false,
     this.sandboxSourceUri,
   });
 
@@ -116,6 +123,7 @@ class CompactAppBarTitleView extends StatelessWidget {
   final Widget? tabIcon;
   final bool longPressUrlCopy;
   final Color? containerColor;
+  final bool useCustomColor;
   final Uri? sandboxSourceUri;
 
   @override
@@ -124,7 +132,11 @@ class CompactAppBarTitleView extends StatelessWidget {
     final appColors = AppColors.of(context);
     final containerColor = this.containerColor;
     final containerPalette = containerColor != null
-        ? ContainerColors.palette(context, containerColor)
+        ? ContainerColors.palette(
+            context,
+            containerColor,
+            useCustomColor: useCustomColor,
+          )
         : null;
 
     return Row(
@@ -241,9 +253,14 @@ class CompactAppBarTitleView extends StatelessWidget {
 }
 
 class AppBarTitle extends ConsumerWidget {
-  const AppBarTitle({super.key, this.containerColor});
+  const AppBarTitle({
+    super.key,
+    this.containerColor,
+    this.useCustomColor = false,
+  });
 
   final Color? containerColor;
+  final bool useCustomColor;
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
@@ -278,6 +295,7 @@ class AppBarTitle extends ConsumerWidget {
       siteSettingsBadgeState: siteSettingsBadgeState,
       longPressUrlCopy: settings.tabBarLongPressUrlCopy,
       containerColor: containerColor,
+      useCustomColor: useCustomColor,
       sandboxSourceUri: sandboxSourceUri,
       onSiteSettingsTap: () {
         ref
@@ -306,6 +324,7 @@ class AppBarTitleView extends StatelessWidget {
     required this.longPressUrlCopy,
     this.tabIcon,
     this.containerColor,
+    this.useCustomColor = false,
     this.sandboxSourceUri,
   });
 
@@ -317,6 +336,7 @@ class AppBarTitleView extends StatelessWidget {
   final Widget? tabIcon;
   final bool longPressUrlCopy;
   final Color? containerColor;
+  final bool useCustomColor;
   final Uri? sandboxSourceUri;
 
   @override
@@ -325,7 +345,11 @@ class AppBarTitleView extends StatelessWidget {
     final appColors = AppColors.of(context);
     final containerColor = this.containerColor;
     final containerPalette = containerColor != null
-        ? ContainerColors.palette(context, containerColor)
+        ? ContainerColors.palette(
+            context,
+            containerColor,
+            useCustomColor: useCustomColor,
+          )
         : null;
 
     return Row(

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

@@ -236,6 +236,11 @@ class BrowserTabBar extends HookConsumerWidget {
         selectedTabId,
       ).select((data) => data.value?.color),
     );
+    final containerUseCustomColor = ref.watch(
+      watchTabContainerDataProvider(
+        selectedTabId,
+      ).select((data) => data.value?.metadata.useCustomColor ?? false),
+    );
 
     final quickTabSwitcherMode = settings.effectiveUiQuickTabSwitcherMode();
 
@@ -251,8 +256,14 @@ class BrowserTabBar extends HookConsumerWidget {
             displayedSheet is! ViewTabsSheet)
         ? containerColor
         : null;
+    final effectiveUseCustomColor =
+        effectiveContainerColor != null && containerUseCustomColor;
     final effectiveContainerPalette = effectiveContainerColor != null
-        ? ContainerColors.palette(context, effectiveContainerColor)
+        ? ContainerColors.palette(
+            context,
+            effectiveContainerColor,
+            useCustomColor: effectiveUseCustomColor,
+          )
         : null;
 
     return BrowserTabBarView(
@@ -264,8 +275,14 @@ class BrowserTabBar extends HookConsumerWidget {
       backgroundColor: effectiveContainerPalette?.surfaceColor,
       title: showTabTitle
           ? settings.tabBarLayout == TabBarLayout.compact
-                ? CompactAppBarTitle(containerColor: effectiveContainerColor)
+                ? CompactAppBarTitle(
-                : AppBarTitle(containerColor: effectiveContainerColor)
+                    containerColor: effectiveContainerColor,
+                    useCustomColor: effectiveUseCustomColor,
+                  )
+                : AppBarTitle(
+                    containerColor: effectiveContainerColor,
+                    useCustomColor: effectiveUseCustomColor,
+                  )
           : null,
       actions: [
         const PinnedAddonBar(),
@@ -457,6 +474,7 @@ class BrowserTabBarView extends StatelessWidget {
 
 class QuickTabSwitcherItem with FastEquatable {
   final Color? color;
+  final bool useCustomColor;
   final String id;
   final bool isActive;
   final TabMode tabMode;
@@ -478,6 +496,7 @@ class QuickTabSwitcherItem with FastEquatable {
     required this.title,
     required this.url,
     required this.avatar,
+    this.useCustomColor = false,
     this.isSandbox = false,
     this.depth = 0,
   });
@@ -485,6 +504,7 @@ class QuickTabSwitcherItem with FastEquatable {
   @override
   List<Object?> get hashParameters => [
     color,
+    useCustomColor,
     id,
     isActive,
     tabMode,
@@ -577,6 +597,7 @@ class QuickTabSwitcher extends HookConsumerWidget {
           : state.$1.titleOrAuthority;
       return QuickTabSwitcherItem(
         color: state.$2?.color,
+        useCustomColor: state.$2?.metadata.useCustomColor ?? false,
         id: state.$1.id,
         isActive: state.$1.id == selectedTabId,
         title: displayTitle,
@@ -910,16 +931,26 @@ class QuickTabSwitcherView extends StatelessWidget {
         final color? when isSelected => ContainerColors.palette(
           context,
           color,
+          useCustomColor: item.useCustomColor,
         ).selectedBackgroundColor,
-        final color? => ContainerColors.palette(context, color).backgroundColor,
+        final color? => ContainerColors.palette(
+          context,
+          color,
+          useCustomColor: item.useCustomColor,
+        ).backgroundColor,
         null => null,
       },
       side: (item, isSelected) => switch (item.color) {
         final color? when isSelected => ContainerColors.palette(
           context,
           color,
+          useCustomColor: item.useCustomColor,
         ).selectedBorderSide,
-        final color? => ContainerColors.palette(context, color).borderSide,
+        final color? => ContainerColors.palette(
+          context,
+          color,
+          useCustomColor: item.useCustomColor,
+        ).borderSide,
         null => null,
       },
       labelPadding: (item) =>
@@ -1015,8 +1046,13 @@ class QuickTabSwitcherView extends StatelessWidget {
                   ? ContainerColors.palette(
                       context,
                       color,
+                      useCustomColor: item.useCustomColor,
                     ).selectedForegroundColor
-                  : ContainerColors.palette(context, color).foregroundColor,
+                  : ContainerColors.palette(
+                      context,
+                      color,
+                      useCustomColor: item.useCustomColor,
+                    ).foregroundColor,
               fontWeight: isSelected ? FontWeight.w700 : FontWeight.w500,
             ),
             child: row,

apps/weblibre/lib/features/geckoview/features/search/presentation/widgets/empty_state/recent_tabs_section.dart

@@ -67,6 +67,8 @@ class RecentTabsSection extends ConsumerWidget {
                       iconSize: UrlListTile.iconSize,
                     ),
                     containerColor: containerData?.color,
+                    useCustomColor:
+                        containerData?.metadata.useCustomColor ?? false,
                     onTap: () => onTabSelected(tabState.id),
                   );
                 },

apps/weblibre/lib/features/geckoview/features/tabs/data/models/container_data.dart

@@ -53,6 +53,12 @@ class ContainerMetadata with FastEquatable {
   @JsonKey(defaultValue: false)
   final bool bypassGlobalProxy;
 
+  // When true, ContainerData.color is used directly as primaryContainer
+  // instead of being fed through ColorScheme.fromSeed. Lets power users pick
+  // any color (including dark/black) at the cost of M3 harmonization.
+  @JsonKey(defaultValue: false)
+  final bool useCustomColor;
+
   final List<Uri>? assignedSites;
 
   ContainerMetadata({
@@ -62,6 +68,7 @@ class ContainerMetadata with FastEquatable {
     required this.clearDataOnExit,
     required this.excludeFromIndex,
     required this.bypassGlobalProxy,
+    required this.useCustomColor,
     required this.assignedSites,
   });
 
@@ -72,6 +79,7 @@ class ContainerMetadata with FastEquatable {
     bool? clearDataOnExit,
     bool? excludeFromIndex,
     bool? bypassGlobalProxy,
+    bool? useCustomColor,
     List<Uri>? assignedSites,
   }) : this(
          iconData: iconData,
@@ -80,6 +88,7 @@ class ContainerMetadata with FastEquatable {
          clearDataOnExit: clearDataOnExit ?? false,
          excludeFromIndex: excludeFromIndex ?? false,
          bypassGlobalProxy: bypassGlobalProxy ?? false,
+         useCustomColor: useCustomColor ?? false,
          assignedSites: assignedSites,
        );
 
@@ -98,6 +107,7 @@ class ContainerMetadata with FastEquatable {
     clearDataOnExit,
     excludeFromIndex,
     bypassGlobalProxy,
+    useCustomColor,
     assignedSites,
   ];
 }

apps/weblibre/lib/features/geckoview/features/tabs/data/models/container_data.g.dart

@@ -19,6 +19,8 @@ abstract class _$ContainerMetadataCWProxy {
 
   ContainerMetadata bypassGlobalProxy(bool bypassGlobalProxy);
 
+  ContainerMetadata useCustomColor(bool useCustomColor);
+
   ContainerMetadata assignedSites(List<Uri>? assignedSites);
 
   /// Creates a new instance with the provided field values.
@@ -35,6 +37,7 @@ abstract class _$ContainerMetadataCWProxy {
     bool clearDataOnExit,
     bool excludeFromIndex,
     bool bypassGlobalProxy,
+    bool useCustomColor,
     List<Uri>? assignedSites,
   });
 }
@@ -69,6 +72,10 @@ class _$ContainerMetadataCWProxyImpl implements _$ContainerMetadataCWProxy {
   ContainerMetadata bypassGlobalProxy(bool bypassGlobalProxy) =>
       call(bypassGlobalProxy: bypassGlobalProxy);
 
+  @override
+  ContainerMetadata useCustomColor(bool useCustomColor) =>
+      call(useCustomColor: useCustomColor);
+
   @override
   ContainerMetadata assignedSites(List<Uri>? assignedSites) =>
       call(assignedSites: assignedSites);
@@ -88,6 +95,7 @@ class _$ContainerMetadataCWProxyImpl implements _$ContainerMetadataCWProxy {
     Object? clearDataOnExit = const $CopyWithPlaceholder(),
     Object? excludeFromIndex = const $CopyWithPlaceholder(),
     Object? bypassGlobalProxy = const $CopyWithPlaceholder(),
+    Object? useCustomColor = const $CopyWithPlaceholder(),
     Object? assignedSites = const $CopyWithPlaceholder(),
   }) {
     return ContainerMetadata(
@@ -121,6 +129,12 @@ class _$ContainerMetadataCWProxyImpl implements _$ContainerMetadataCWProxy {
           ? _value.bypassGlobalProxy
           // ignore: cast_nullable_to_non_nullable
           : bypassGlobalProxy as bool,
+      useCustomColor:
+          useCustomColor == const $CopyWithPlaceholder() ||
+              useCustomColor == null
+          ? _value.useCustomColor
+          // ignore: cast_nullable_to_non_nullable
+          : useCustomColor as bool,
       assignedSites: assignedSites == const $CopyWithPlaceholder()
           ? _value.assignedSites
           // ignore: cast_nullable_to_non_nullable
@@ -262,6 +276,7 @@ ContainerMetadata _$ContainerMetadataFromJson(Map<String, dynamic> json) =>
       clearDataOnExit: json['clearDataOnExit'] as bool? ?? false,
       excludeFromIndex: json['excludeFromIndex'] as bool? ?? false,
       bypassGlobalProxy: json['bypassGlobalProxy'] as bool? ?? false,
+      useCustomColor: json['useCustomColor'] as bool? ?? false,
       assignedSites: (json['assignedSites'] as List<dynamic>?)
           ?.map((e) => Uri.parse(e as String))
           .toList(),
@@ -279,6 +294,7 @@ Map<String, dynamic> _$ContainerMetadataToJson(
   'clearDataOnExit': instance.clearDataOnExit,
   'excludeFromIndex': instance.excludeFromIndex,
   'bypassGlobalProxy': instance.bypassGlobalProxy,
+  'useCustomColor': instance.useCustomColor,
   'assignedSites': instance.assignedSites?.map((e) => e.toString()).toList(),
 };
 

apps/weblibre/lib/features/geckoview/features/tabs/domain/repositories/container.dart

@@ -17,9 +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:math';
 import 'dart:ui';
 
-import 'package:collection/collection.dart';
 import 'package:nullability/nullability.dart';
 import 'package:riverpod_annotation/riverpod_annotation.dart';
 import 'package:weblibre/core/uuid.dart';
@@ -299,22 +299,12 @@ class ContainerRepository extends _$ContainerRepository {
   }
 
   Future<Color> unusedRandomContainerColor() async {
-    final usedColors = await getDistinctColors();
+    final usedColors = (await getDistinctColors()).toSet();
-    final unusedColorTypes = colorTypes.where((colors) {
+    final unused = containerSeedColors
-      return !shadingTypes(
+        .where((color) => !usedColors.contains(color))
-        colors,
-      ).any((shade) => usedColors.contains(shade.keys.first));
-    }).toList();
-    final availableColors =
-        (unusedColorTypes.isNotEmpty ? unusedColorTypes : colorTypes).flattened
         .toList();
-
+    final pool = unused.isNotEmpty ? unused : containerSeedColors;
-    Color randomColor;
+    return pool[Random().nextInt(pool.length)];
-    do {
-      randomColor = randomColorShade(availableColors);
-    } while (usedColors.contains(randomColor));
-
-    return randomColor;
   }
 
   Future<ContainerData> createNewContainer() async {

apps/weblibre/lib/features/geckoview/features/tabs/domain/repositories/container.g.dart

@@ -42,7 +42,7 @@ final class ContainerRepositoryProvider
 }
 
 String _$containerRepositoryHash() =>
-    r'14c77b4f3ed21d9511d5bf507db013b02a122595';
+    r'b967f8948baf4347346a1369ad48a476da69e3a2';
 
 abstract class _$ContainerRepository extends $Notifier<void> {
   void build();

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

@@ -88,6 +88,7 @@ class ContainerEditScreen extends HookConsumerWidget {
     );
 
     final selectedColor = useState(initialContainer.color);
+    final useCustomColor = useState(initialContainer.metadata.useCustomColor);
     final selectedIcon = useState(initialContainer.metadata.iconData);
     final contextualIdentity = useState(
       initialContainer.metadata.contextualIdentity,
@@ -129,6 +130,7 @@ class ContainerEditScreen extends HookConsumerWidget {
               contextualIdentity.value != null &&
               proxyConnectionId.value == null &&
               bypassGlobalProxy.value,
+          useCustomColor: useCustomColor.value,
           assignedSites: assignedSites.value,
         ),
       );
@@ -160,13 +162,17 @@ class ContainerEditScreen extends HookConsumerWidget {
     }
 
     Future<void> openColorPicker() async {
-      final color = await showDialog<Color?>(
+      final result = await showDialog<ColorPickerResult?>(
         context: context,
-        builder: (context) => ColorPickerDialog(selectedColor.value),
+        builder: (context) => ColorPickerDialog(
+          selectedColor.value,
+          initialUseCustomColor: useCustomColor.value,
+        ),
       );
 
-      if (color != null) {
+      if (result != null) {
-        selectedColor.value = color;
+        selectedColor.value = result.color;
+        useCustomColor.value = result.useCustomColor;
       }
     }
 
@@ -179,6 +185,7 @@ class ContainerEditScreen extends HookConsumerWidget {
           heightFactor: 0.92,
           child: ContainerIconPickerSheet(
             selectedColor: selectedColor.value,
+            useCustomColor: useCustomColor.value,
             selectedIcon: resolveContainerIcon(selectedIcon.value),
             onSelected: (iconData) => Navigator.of(context).pop(iconData),
           ),
@@ -245,6 +252,7 @@ class ContainerEditScreen extends HookConsumerWidget {
     final previewPalette = ContainerColors.palette(
       context,
       selectedColor.value,
+      useCustomColor: useCustomColor.value,
     );
     final assignedSiteCount = assignedSites.value?.length ?? 0;
     final canPickProxy =

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

@@ -183,7 +183,11 @@ class _ContainerCard extends HookConsumerWidget {
     final colorScheme = theme.colorScheme;
     final containerColor = container.color;
     final tabCount = container.tabCount ?? 0;
-    final palette = ContainerColors.palette(context, containerColor);
+    final palette = ContainerColors.palette(
+      context,
+      containerColor,
+      useCustomColor: container.metadata.useCustomColor,
+    );
     final proxyOptions = ref.watch(proxyConnectionOptionsProvider);
     final proxyOptionsState = ref.watch(singboxProxyProfilesRepositoryProvider);
     final proxyOptionsLoading =

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

@@ -240,7 +240,11 @@ class _SelectionContainerCard extends ConsumerWidget {
     final colorScheme = theme.colorScheme;
     final containerColor = container.color;
     final tabCount = container.tabCount ?? 0;
-    final palette = ContainerColors.palette(context, containerColor);
+    final palette = ContainerColors.palette(
+      context,
+      containerColor,
+      useCustomColor: container.metadata.useCustomColor,
+    );
 
     final proxyOptions = ref.watch(proxyConnectionOptionsProvider);
     final proxyOptionsState = ref.watch(singboxProxyProfilesRepositoryProvider);

apps/weblibre/lib/features/geckoview/features/tabs/presentation/widgets/color_picker_dialog.dart

@@ -19,53 +19,206 @@
  */
 import 'package:flutter/material.dart';
 import 'package:flutter_hooks/flutter_hooks.dart';
-import 'package:weblibre/features/geckoview/features/tabs/presentation/widgets/material_color_picker.dart';
+import 'package:weblibre/features/geckoview/features/tabs/presentation/widgets/custom_color_picker_dialog.dart';
+import 'package:weblibre/features/geckoview/features/tabs/utils/color_palette.dart';
 import 'package:weblibre/features/geckoview/features/tabs/utils/container_colors.dart';
 
+typedef ColorPickerResult = ({Color color, bool useCustomColor});
+
 class ColorPickerDialog extends HookWidget {
   final Color initialColor;
+  final bool initialUseCustomColor;
 
-  const ColorPickerDialog(this.initialColor, {super.key});
+  const ColorPickerDialog(
+    this.initialColor, {
+    this.initialUseCustomColor = false,
+    super.key,
+  });
 
   @override
   Widget build(BuildContext context) {
     final selectedColor = useState<Color>(initialColor);
+    final useCustom = useState<bool>(initialUseCustomColor);
+
+    Future<void> openCustomPicker() async {
+      final result = await showDialog<Color?>(
+        context: context,
+        builder: (_) => CustomColorPickerDialog(selectedColor.value),
+      );
+      if (result != null) {
+        selectedColor.value = result;
+        useCustom.value = true;
+      }
+    }
 
     return AlertDialog(
       titlePadding: const EdgeInsets.fromLTRB(24.0, 24.0, 24.0, 16.0),
-      contentPadding: const EdgeInsets.only(
+      contentPadding: const EdgeInsets.symmetric(
-        left: 20.0,
+        horizontal: 20.0,
-        right: 20.0,
+        vertical: 8.0,
-        bottom: 24.0,
       ),
       insetPadding: const EdgeInsets.symmetric(
         horizontal: 20.0,
         vertical: 24.0,
       ),
       title: const Text('Select Color'),
-      content: MaterialPicker(
+      content: _ContainerColorGrid(
-        pickerColor: selectedColor.value,
+        selectedColor: selectedColor.value,
-        onColorChanged: (value) {
+        useCustomColor: useCustom.value,
-          selectedColor.value = value;
+        onSeedSelected: (color) {
-        },
+          selectedColor.value = color;
-        displayColorBuilder: (context, color) {
+          useCustom.value = false;
-          return ContainerColors.palette(context, color).containerColor;
         },
+        onCustomTapped: openCustomPicker,
       ),
       actions: [
         TextButton(
-          onPressed: () {
+          onPressed: () => Navigator.pop<ColorPickerResult?>(context),
-            Navigator.pop<Color?>(context);
-          },
           child: const Text('Cancel'),
         ),
         TextButton(
-          onPressed: () {
+          onPressed: () => Navigator.pop<ColorPickerResult?>(
-            Navigator.pop<Color?>(context, selectedColor.value);
+            context,
-          },
+            (color: selectedColor.value, useCustomColor: useCustom.value),
+          ),
           child: const Text('Select'),
         ),
       ],
     );
   }
 }
+
+class _ContainerColorGrid extends StatelessWidget {
+  const _ContainerColorGrid({
+    required this.selectedColor,
+    required this.useCustomColor,
+    required this.onSeedSelected,
+    required this.onCustomTapped,
+  });
+
+  final Color selectedColor;
+  final bool useCustomColor;
+  final ValueChanged<Color> onSeedSelected;
+  final VoidCallback onCustomTapped;
+
+  @override
+  Widget build(BuildContext context) {
+    final itemCount = containerSeedColors.length + 1;
+    return SizedBox(
+      width: 320,
+      child: GridView.builder(
+        shrinkWrap: true,
+        padding: const EdgeInsets.symmetric(vertical: 8.0),
+        gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
+          crossAxisCount: 6,
+          mainAxisSpacing: 8,
+          crossAxisSpacing: 8,
+        ),
+        itemCount: itemCount,
+        itemBuilder: (context, index) {
+          if (index == containerSeedColors.length) {
+            return _CustomSwatch(
+              isSelected: useCustomColor,
+              selectedColor: selectedColor,
+              onTap: onCustomTapped,
+            );
+          }
+          final seed = containerSeedColors[index];
+          final palette = ContainerColors.palette(context, seed);
+          final isSelected =
+              !useCustomColor && seed.toARGB32() == selectedColor.toARGB32();
+          return _Swatch(
+            displayColor: palette.containerColor,
+            checkColor: palette.onContainerColor,
+            isSelected: isSelected,
+            onTap: () => onSeedSelected(seed),
+          );
+        },
+      ),
+    );
+  }
+}
+
+class _Swatch extends StatelessWidget {
+  const _Swatch({
+    required this.displayColor,
+    required this.checkColor,
+    required this.isSelected,
+    required this.onTap,
+  });
+
+  final Color displayColor;
+  final Color checkColor;
+  final bool isSelected;
+  final VoidCallback onTap;
+
+  @override
+  Widget build(BuildContext context) {
+    return InkResponse(
+      onTap: onTap,
+      radius: 28,
+      child: DecoratedBox(
+        decoration: BoxDecoration(
+          color: displayColor,
+          shape: BoxShape.circle,
+          border: isSelected
+              ? Border.all(
+                  color: Theme.of(context).colorScheme.onSurface,
+                  width: 2,
+                )
+              : null,
+        ),
+        child: isSelected
+            ? Icon(Icons.check, size: 20, color: checkColor)
+            : const SizedBox.expand(),
+      ),
+    );
+  }
+}
+
+class _CustomSwatch extends StatelessWidget {
+  const _CustomSwatch({
+    required this.isSelected,
+    required this.selectedColor,
+    required this.onTap,
+  });
+
+  final bool isSelected;
+  final Color selectedColor;
+  final VoidCallback onTap;
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final palette = isSelected
+        ? ContainerColors.palette(
+            context,
+            selectedColor,
+            useCustomColor: true,
+          )
+        : null;
+    return InkResponse(
+      onTap: onTap,
+      radius: 28,
+      child: DecoratedBox(
+        decoration: BoxDecoration(
+          shape: BoxShape.circle,
+          color: palette?.containerColor ?? Colors.transparent,
+          border: Border.all(
+            color: isSelected
+                ? colorScheme.onSurface
+                : colorScheme.outline.withValues(alpha: 0.5),
+            width: 2,
+          ),
+        ),
+        child: isSelected
+            ? Icon(Icons.check, size: 20, color: palette!.onContainerColor)
+            : Icon(
+                Icons.colorize,
+                size: 18,
+                color: colorScheme.onSurfaceVariant.withValues(alpha: 0.7),
+              ),
+      ),
+    );
+  }
+}

apps/weblibre/lib/features/geckoview/features/tabs/presentation/widgets/compact_container_selector.dart

@@ -61,7 +61,11 @@ class CompactContainerSelector extends ConsumerWidget {
     final isSelected = selectedContainer != null;
     final accentColor = selectedContainer?.color ?? colorScheme.primary;
     final showSelectedHighlight = isSelected && emphasizeSelection;
-    final palette = ContainerColors.palette(context, accentColor);
+    final palette = ContainerColors.palette(
+      context,
+      accentColor,
+      useCustomColor: selectedContainer?.metadata.useCustomColor ?? false,
+    );
 
     return GestureDetector(
       onLongPress: isSelected

apps/weblibre/lib/features/geckoview/features/tabs/presentation/widgets/container_chip_content.dart

@@ -31,7 +31,11 @@ Widget? buildContainerChipAvatar(
   bool isSelected, {
   double size = 18,
 }) {
-  final palette = ContainerColors.palette(context, container.color);
+  final palette = ContainerColors.palette(
+    context,
+    container.color,
+    useCustomColor: container.metadata.useCustomColor,
+  );
 
   return chipContainerIcon(container.metadata.iconData).mapNotNull(
     (iconData) => Icon(
@@ -48,7 +52,11 @@ Widget buildContainerChipLabel(
   bool isSelected, {
   Widget? trailing,
 }) {
-  final palette = ContainerColors.palette(context, container.color);
+  final palette = ContainerColors.palette(
+    context,
+    container.color,
+    useCustomColor: container.metadata.useCustomColor,
+  );
   final foregroundColor = isSelected
       ? palette.selectedForegroundColor
       : palette.foregroundColor;

apps/weblibre/lib/features/geckoview/features/tabs/presentation/widgets/container_chips.dart

@@ -42,22 +42,45 @@ import 'package:weblibre/features/user/domain/repositories/general_settings.dart
 import 'package:weblibre/presentation/widgets/inline_count_badge.dart';
 import 'package:weblibre/presentation/widgets/selectable_chips.dart';
 
-ContainerColorPalette _palette(BuildContext context, Color color) {
+ContainerColorPalette _palette(
-  return ContainerColors.palette(context, color);
+  BuildContext context,
+  Color color, {
+  bool useCustomColor = false,
+}) {
+  return ContainerColors.palette(
+    context,
+    color,
+    useCustomColor: useCustomColor,
+  );
 }
 
-Color _chipColor(BuildContext context, Color color, bool isSelected) {
+Color _chipColor(
-  final palette = _palette(context, color);
+  BuildContext context,
+  Color color,
+  bool isSelected, {
+  bool useCustomColor = false,
+}) {
+  final palette = _palette(context, color, useCustomColor: useCustomColor);
   return isSelected ? palette.selectedBackgroundColor : palette.backgroundColor;
 }
 
-BorderSide _chipSide(BuildContext context, Color color, bool isSelected) {
+BorderSide _chipSide(
-  final palette = _palette(context, color);
+  BuildContext context,
+  Color color,
+  bool isSelected, {
+  bool useCustomColor = false,
+}) {
+  final palette = _palette(context, color, useCustomColor: useCustomColor);
   return isSelected ? palette.selectedBorderSide : palette.borderSide;
 }
 
-InlineCountBadge _countBadge(BuildContext context, Color color, int count) {
+InlineCountBadge _countBadge(
-  final palette = _palette(context, color);
+  BuildContext context,
+  Color color,
+  int count, {
+  bool useCustomColor = false,
+}) {
+  final palette = _palette(context, color, useCustomColor: useCustomColor);
   return InlineCountBadge(
     count: count,
     backgroundColor: palette.badgeBackgroundColor,
@@ -404,10 +427,18 @@ class ContainerChips extends HookConsumerWidget {
                         cacheExtent: 500,
                         itemId: (container) => container.id,
                         decoration: SelectableChipDecoration(
-                          color: (container, isSelected) =>
+                          color: (container, isSelected) => _chipColor(
-                              _chipColor(context, container.color, isSelected),
+                            context,
-                          side: (container, isSelected) =>
+                            container.color,
-                              _chipSide(context, container.color, isSelected),
+                            isSelected,
+                            useCustomColor: container.metadata.useCustomColor,
+                          ),
+                          side: (container, isSelected) => _chipSide(
+                            context,
+                            container.color,
+                            isSelected,
+                            useCustomColor: container.metadata.useCustomColor,
+                          ),
                         ),
                         itemAvatar: (container) {
                           final isSelected =
@@ -432,7 +463,13 @@ class ContainerChips extends HookConsumerWidget {
                             container,
                             isSelected,
                             trailing: count != null && count > 0
-                                ? _countBadge(context, container.color, count)
+                                ? _countBadge(
+                                    context,
+                                    container.color,
+                                    count,
+                                    useCustomColor:
+                                        container.metadata.useCustomColor,
+                                  )
                                 : null,
                           );
                         },

apps/weblibre/lib/features/geckoview/features/tabs/presentation/widgets/container_icon_picker_sheet.dart

@@ -42,17 +42,23 @@ class ContainerIconPickerSheet extends HookWidget {
     required this.selectedColor,
     required this.selectedIcon,
     required this.onSelected,
+    this.useCustomColor = false,
     super.key,
   });
 
   final Color selectedColor;
   final IconData selectedIcon;
+  final bool useCustomColor;
   final ValueChanged<IconData> onSelected;
 
   @override
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
-    final palette = ContainerColors.palette(context, selectedColor);
+    final palette = ContainerColors.palette(
+      context,
+      selectedColor,
+      useCustomColor: useCustomColor,
+    );
     final searchController = useTextEditingController();
     useListenable(searchController);
 

apps/weblibre/lib/features/geckoview/features/tabs/presentation/widgets/container_list_tile.dart

@@ -38,7 +38,11 @@ class ContainerListTile extends HookWidget {
 
   @override
   Widget build(BuildContext context) {
-    final palette = ContainerColors.palette(context, container.color);
+    final palette = ContainerColors.palette(
+      context,
+      container.color,
+      useCustomColor: container.metadata.useCustomColor,
+    );
 
     return ListTileTheme(
       selectedColor: palette.onContainerColor,

apps/weblibre/lib/features/geckoview/features/tabs/presentation/widgets/custom_color_picker_dialog.dart

@@ -0,0 +1,267 @@
+/*
+ * 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/material.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_hooks/flutter_hooks.dart';
+import 'package:weblibre/features/geckoview/features/tabs/utils/container_colors.dart';
+
+/// Freeform color picker for power users.
+///
+/// Returns a [Color] (full opacity) intended to be used as the container's
+/// stored color with `useCustomColor: true`. The preview swatch shows the
+/// actual `containerColor` that [ContainerColors.palette] will produce in
+/// custom mode, so what the user sees is what the chip will look like.
+class CustomColorPickerDialog extends HookWidget {
+  final Color initialColor;
+
+  const CustomColorPickerDialog(this.initialColor, {super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    final hsl = useState<HSLColor>(HSLColor.fromColor(initialColor));
+    final hexController = useTextEditingController(text: _toHex(initialColor));
+
+    void updateHsl(HSLColor next) {
+      hsl.value = next;
+      final hex = _toHex(next.toColor());
+      if (hexController.text.toUpperCase() != hex) {
+        hexController.text = hex;
+      }
+    }
+
+    void onHexSubmitted(String value) {
+      final parsed = _parseHex(value);
+      if (parsed != null) {
+        hsl.value = HSLColor.fromColor(parsed);
+        hexController.text = _toHex(parsed);
+      } else {
+        hexController.text = _toHex(hsl.value.toColor());
+      }
+    }
+
+    final color = hsl.value.toColor();
+    final palette = ContainerColors.palette(
+      context,
+      color,
+      useCustomColor: true,
+    );
+
+    return AlertDialog(
+      titlePadding: const EdgeInsets.fromLTRB(24.0, 24.0, 24.0, 16.0),
+      contentPadding: const EdgeInsets.symmetric(
+        horizontal: 20.0,
+        vertical: 8.0,
+      ),
+      title: const Text('Custom Color'),
+      content: SizedBox(
+        width: 320,
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            _PreviewSwatch(palette: palette),
+            const SizedBox(height: 16),
+            TextField(
+              controller: hexController,
+              decoration: const InputDecoration(
+                labelText: 'Hex',
+                prefixText: '#',
+                isDense: true,
+                border: OutlineInputBorder(),
+              ),
+              textCapitalization: TextCapitalization.characters,
+              inputFormatters: [
+                FilteringTextInputFormatter.allow(RegExp('[0-9a-fA-F]')),
+                LengthLimitingTextInputFormatter(6),
+              ],
+              onSubmitted: onHexSubmitted,
+              onChanged: (value) {
+                if (value.length == 6) onHexSubmitted(value);
+              },
+            ),
+            const SizedBox(height: 12),
+            _GradientSlider(
+              label: 'Hue',
+              value: hsl.value.hue,
+              max: 360,
+              gradient: const LinearGradient(
+                colors: [
+                  Color(0xFFFF0000),
+                  Color(0xFFFFFF00),
+                  Color(0xFF00FF00),
+                  Color(0xFF00FFFF),
+                  Color(0xFF0000FF),
+                  Color(0xFFFF00FF),
+                  Color(0xFFFF0000),
+                ],
+              ),
+              onChanged: (v) => updateHsl(hsl.value.withHue(v)),
+            ),
+            _GradientSlider(
+              label: 'Saturation',
+              value: hsl.value.saturation,
+              max: 1,
+              gradient: LinearGradient(
+                colors: [
+                  HSLColor.fromAHSL(
+                    1,
+                    hsl.value.hue,
+                    0,
+                    hsl.value.lightness,
+                  ).toColor(),
+                  HSLColor.fromAHSL(
+                    1,
+                    hsl.value.hue,
+                    1,
+                    hsl.value.lightness,
+                  ).toColor(),
+                ],
+              ),
+              onChanged: (v) => updateHsl(hsl.value.withSaturation(v)),
+            ),
+            _GradientSlider(
+              label: 'Lightness',
+              value: hsl.value.lightness,
+              max: 1,
+              gradient: LinearGradient(
+                colors: [
+                  Colors.black,
+                  HSLColor.fromAHSL(
+                    1,
+                    hsl.value.hue,
+                    hsl.value.saturation,
+                    0.5,
+                  ).toColor(),
+                  Colors.white,
+                ],
+              ),
+              onChanged: (v) => updateHsl(hsl.value.withLightness(v)),
+            ),
+          ],
+        ),
+      ),
+      actions: [
+        TextButton(
+          onPressed: () => Navigator.pop<Color?>(context),
+          child: const Text('Cancel'),
+        ),
+        TextButton(
+          onPressed: () => Navigator.pop<Color?>(context, color),
+          child: const Text('Select'),
+        ),
+      ],
+    );
+  }
+}
+
+class _PreviewSwatch extends StatelessWidget {
+  const _PreviewSwatch({required this.palette});
+
+  final ContainerColorPalette palette;
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      width: 96,
+      height: 96,
+      decoration: BoxDecoration(
+        color: palette.containerColor,
+        shape: BoxShape.circle,
+        border: Border.all(color: palette.outlineColor, width: 2),
+      ),
+      alignment: Alignment.center,
+      child: Icon(Icons.check, color: palette.onContainerColor, size: 32),
+    );
+  }
+}
+
+class _GradientSlider extends StatelessWidget {
+  const _GradientSlider({
+    required this.label,
+    required this.value,
+    required this.max,
+    required this.gradient,
+    required this.onChanged,
+  });
+
+  final String label;
+  final double value;
+  final double max;
+  final Gradient gradient;
+  final ValueChanged<double> onChanged;
+
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.symmetric(vertical: 4),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Text(label, style: Theme.of(context).textTheme.labelSmall),
+          SizedBox(
+            height: 36,
+            child: Stack(
+              alignment: Alignment.center,
+              children: [
+                Container(
+                  margin: const EdgeInsets.symmetric(horizontal: 16),
+                  height: 10,
+                  decoration: BoxDecoration(
+                    borderRadius: BorderRadius.circular(5),
+                    gradient: gradient,
+                  ),
+                ),
+                SliderTheme(
+                  data: SliderTheme.of(context).copyWith(
+                    activeTrackColor: Colors.transparent,
+                    inactiveTrackColor: Colors.transparent,
+                    overlayColor: Colors.transparent,
+                    thumbShape: const RoundSliderThumbShape(
+                      enabledThumbRadius: 10,
+                    ),
+                  ),
+                  child: Slider(
+                    value: value.clamp(0, max).toDouble(),
+                    max: max,
+                    onChanged: onChanged,
+                  ),
+                ),
+              ],
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+String _toHex(Color color) {
+  final r = (color.r * 255).round().toRadixString(16).padLeft(2, '0');
+  final g = (color.g * 255).round().toRadixString(16).padLeft(2, '0');
+  final b = (color.b * 255).round().toRadixString(16).padLeft(2, '0');
+  return '$r$g$b'.toUpperCase();
+}
+
+Color? _parseHex(String value) {
+  final cleaned = value.replaceAll('#', '').trim();
+  if (cleaned.length != 6) return null;
+  final parsed = int.tryParse(cleaned, radix: 16);
+  if (parsed == null) return null;
+  return Color(0xFF000000 | parsed);
+}

apps/weblibre/lib/features/geckoview/features/tabs/presentation/widgets/material_color_picker.dart

@@ -1,405 +0,0 @@
-/*
- * 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/>.
- */
-
-// The Color Picker which contains Material Design Color Palette.
-import 'package:fading_scroll/fading_scroll.dart';
-import 'package:flutter/gestures.dart';
-import 'package:flutter/material.dart';
-import 'package:weblibre/features/geckoview/features/tabs/utils/color_palette.dart';
-
-class MaterialPicker extends StatefulWidget {
-  const MaterialPicker({
-    super.key,
-    required this.pickerColor,
-    required this.onColorChanged,
-    this.onPrimaryChanged,
-    this.enableLabel = false,
-    this.portraitOnly = false,
-    this.displayAlpha,
-    this.displayColorBuilder,
-  });
-
-  final Color pickerColor;
-  final ValueChanged<Color> onColorChanged;
-  final ValueChanged<Color>? onPrimaryChanged;
-  final bool enableLabel;
-  final bool portraitOnly;
-  final double? displayAlpha;
-  final Color Function(BuildContext context, Color color)? displayColorBuilder;
-
-  @override
-  State<StatefulWidget> createState() => _MaterialPickerState();
-}
-
-class _MaterialPickerState extends State<MaterialPicker> {
-  List<Color> _currentColorType = [Colors.red, Colors.redAccent];
-  Color _currentShading = Colors.transparent;
-
-  @override
-  void initState() {
-    for (final colors in colorTypes) {
-      shadingTypes(colors).forEach((Map<Color, String> color) {
-        if (widget.pickerColor.toARGB32() == color.keys.first.toARGB32()) {
-          return setState(() {
-            _currentColorType = colors;
-            _currentShading = color.keys.first;
-          });
-        }
-      });
-    }
-    super.initState();
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    final disableAnimations = MediaQuery.disableAnimationsOf(context);
-    final isPortrait =
-        MediaQuery.of(context).orientation == Orientation.portrait ||
-        widget.portraitOnly;
-
-    Color resolveDisplayColor(Color color) {
-      final displayColorBuilder = widget.displayColorBuilder;
-      if (displayColorBuilder != null) {
-        return displayColorBuilder(context, color);
-      }
-
-      return widget.displayAlpha != null
-          ? color.withValues(alpha: widget.displayAlpha)
-          : color;
-    }
-
-    Widget colorList() {
-      return Container(
-        clipBehavior: Clip.hardEdge,
-        decoration: const BoxDecoration(),
-        child: Container(
-          margin: isPortrait
-              ? const EdgeInsets.only(right: 10)
-              : const EdgeInsets.only(bottom: 10),
-          width: isPortrait ? 60 : null,
-          height: isPortrait ? null : 60,
-          decoration: BoxDecoration(
-            color: Theme.of(context).cardColor,
-            boxShadow: [
-              BoxShadow(
-                color: (Theme.of(context).brightness == Brightness.light)
-                    ? (Theme.of(context).brightness == Brightness.light)
-                          ? Colors.grey[300]!
-                          : Colors.black38
-                    : Colors.black38,
-                blurRadius: 10,
-              ),
-            ],
-            border: isPortrait
-                ? Border(
-                    right: BorderSide(
-                      color: (Theme.of(context).brightness == Brightness.light)
-                          ? Colors.grey[300]!
-                          : Colors.black38,
-                    ),
-                  )
-                : Border(
-                    top: BorderSide(
-                      color: (Theme.of(context).brightness == Brightness.light)
-                          ? Colors.grey[300]!
-                          : Colors.black38,
-                    ),
-                  ),
-          ),
-          child: ScrollConfiguration(
-            behavior: ScrollConfiguration.of(
-              context,
-            ).copyWith(dragDevices: PointerDeviceKind.values.toSet()),
-            child: FadingScroll(
-              fadingSize: 25,
-              builder: (context, controller) {
-                return ListView(
-                  controller: controller,
-                  scrollDirection: isPortrait ? Axis.vertical : Axis.horizontal,
-                  children: [
-                    if (isPortrait)
-                      const Padding(padding: EdgeInsets.only(top: 7))
-                    else
-                      const Padding(padding: EdgeInsets.only(left: 7)),
-                    ...colorTypes.map((List<Color> colors) {
-                      final Color colorType = colors[0];
-                      final Color displayColorType = resolveDisplayColor(
-                        colorType,
-                      );
-                      return GestureDetector(
-                        onTap: () {
-                          if (widget.onPrimaryChanged != null) {
-                            widget.onPrimaryChanged!.call(colorType);
-                          }
-                          setState(() => _currentColorType = colors);
-                        },
-                        child: Container(
-                          color: Colors.transparent,
-                          padding: isPortrait
-                              ? const EdgeInsets.fromLTRB(0, 7, 0, 7)
-                              : const EdgeInsets.fromLTRB(7, 0, 7, 0),
-                          child: Align(
-                            child: AnimatedContainer(
-                              duration: disableAnimations
-                                  ? Duration.zero
-                                  : const Duration(milliseconds: 300),
-                              width: 25,
-                              height: 25,
-                              decoration: BoxDecoration(
-                                color: displayColorType,
-                                shape: BoxShape.circle,
-                                boxShadow: _currentColorType == colors
-                                    ? [
-                                        if (colorType ==
-                                            Theme.of(context).cardColor)
-                                          BoxShadow(
-                                            color:
-                                                (Theme.of(context).brightness ==
-                                                    Brightness.light)
-                                                ? Colors.grey[300]!
-                                                : Colors.black38,
-                                            blurRadius: 10,
-                                          )
-                                        else
-                                          BoxShadow(
-                                            color: displayColorType,
-                                            blurRadius: 10,
-                                          ),
-                                      ]
-                                    : null,
-                                border: colorType == Theme.of(context).cardColor
-                                    ? Border.all(
-                                        color:
-                                            (Theme.of(context).brightness ==
-                                                Brightness.light)
-                                            ? Colors.grey[300]!
-                                            : Colors.black38,
-                                      )
-                                    : null,
-                              ),
-                            ),
-                          ),
-                        ),
-                      );
-                    }),
-                    if (isPortrait)
-                      const Padding(padding: EdgeInsets.only(top: 5))
-                    else
-                      const Padding(padding: EdgeInsets.only(left: 5)),
-                  ],
-                );
-              },
-            ),
-          ),
-        ),
-      );
-    }
-
-    Widget shadingList() {
-      return ScrollConfiguration(
-        behavior: ScrollConfiguration.of(
-          context,
-        ).copyWith(dragDevices: PointerDeviceKind.values.toSet()),
-        child: FadingScroll(
-          fadingSize: 25,
-          builder: (context, controller) {
-            return ListView(
-              controller: controller,
-              scrollDirection: isPortrait ? Axis.vertical : Axis.horizontal,
-              children: [
-                if (isPortrait)
-                  const Padding(padding: EdgeInsets.only(top: 15))
-                else
-                  const Padding(padding: EdgeInsets.only(left: 15)),
-                ...shadingTypes(_currentColorType).map((
-                  Map<Color, String> colors,
-                ) {
-                  final Color color = colors.keys.first;
-                  final Color displayColor = resolveDisplayColor(color);
-                  return GestureDetector(
-                    onTap: () {
-                      setState(() => _currentShading = color);
-                      widget.onColorChanged(color);
-                    },
-                    child: Container(
-                      color: Colors.transparent,
-                      margin: isPortrait
-                          ? const EdgeInsets.only(right: 10)
-                          : const EdgeInsets.only(bottom: 10),
-                      padding: isPortrait
-                          ? const EdgeInsets.fromLTRB(0, 7, 0, 7)
-                          : const EdgeInsets.fromLTRB(7, 0, 7, 0),
-                      child: Align(
-                        child: AnimatedContainer(
-                          curve: Curves.fastOutSlowIn,
-                          duration: disableAnimations
-                              ? Duration.zero
-                              : const Duration(milliseconds: 500),
-                          width: isPortrait
-                              ? (_currentShading == color ? 250 : 230)
-                              : (_currentShading == color ? 50 : 30),
-                          height: isPortrait ? 50 : 220,
-                          decoration: BoxDecoration(
-                            color: displayColor,
-                            boxShadow: _currentShading == color
-                                ? [
-                                    if ((color == Colors.white) ||
-                                        (color == Colors.black))
-                                      BoxShadow(
-                                        color:
-                                            (Theme.of(context).brightness ==
-                                                Brightness.light)
-                                            ? Colors.grey[300]!
-                                            : Colors.black38,
-                                        blurRadius: 10,
-                                      )
-                                    else
-                                      BoxShadow(
-                                        color: displayColor,
-                                        blurRadius: 10,
-                                      ),
-                                  ]
-                                : null,
-                            border:
-                                (color == Colors.white) ||
-                                    (color == Colors.black)
-                                ? Border.all(
-                                    color:
-                                        (Theme.of(context).brightness ==
-                                            Brightness.light)
-                                        ? Colors.grey[300]!
-                                        : Colors.black38,
-                                  )
-                                : null,
-                          ),
-                          child: widget.enableLabel
-                              ? isPortrait
-                                    ? Row(
-                                        children: [
-                                          Text(
-                                            '  ${colors.values.first}',
-                                            style: TextStyle(
-                                              color:
-                                                  useWhiteForeground(
-                                                    displayColor,
-                                                  )
-                                                  ? Colors.white
-                                                  : Colors.black,
-                                            ),
-                                          ),
-                                          Expanded(
-                                            child: Align(
-                                              alignment: Alignment.centerRight,
-                                              child: Text(
-                                                '#${color.toString().replaceFirst('Color(0xff', '').replaceFirst(')', '').toUpperCase()}  ',
-                                                style: TextStyle(
-                                                  color:
-                                                      useWhiteForeground(
-                                                        displayColor,
-                                                      )
-                                                      ? Colors.white
-                                                      : Colors.black,
-                                                  fontWeight: FontWeight.bold,
-                                                ),
-                                              ),
-                                            ),
-                                          ),
-                                        ],
-                                      )
-                                    : AnimatedOpacity(
-                                        duration: disableAnimations
-                                            ? Duration.zero
-                                            : const Duration(milliseconds: 300),
-                                        opacity: _currentShading == color
-                                            ? 1
-                                            : 0,
-                                        child: Container(
-                                          padding: const EdgeInsets.only(
-                                            top: 16,
-                                          ),
-                                          alignment: Alignment.topCenter,
-                                          child: Text(
-                                            colors.values.first,
-                                            style: TextStyle(
-                                              color:
-                                                  useWhiteForeground(
-                                                    displayColor,
-                                                  )
-                                                  ? Colors.white
-                                                  : Colors.black,
-                                              fontWeight: FontWeight.bold,
-                                              fontSize: 14,
-                                            ),
-                                            softWrap: false,
-                                          ),
-                                        ),
-                                      )
-                              : const SizedBox(),
-                        ),
-                      ),
-                    ),
-                  );
-                }),
-                if (isPortrait)
-                  const Padding(padding: EdgeInsets.only(top: 15))
-                else
-                  const Padding(padding: EdgeInsets.only(left: 15)),
-              ],
-            );
-          },
-        ),
-      );
-    }
-
-    if (isPortrait) {
-      return SizedBox(
-        width: 350,
-        height: 500,
-        child: Row(
-          children: <Widget>[
-            colorList(),
-            Expanded(
-              child: Padding(
-                padding: const EdgeInsets.symmetric(horizontal: 12),
-                child: shadingList(),
-              ),
-            ),
-          ],
-        ),
-      );
-    } else {
-      return SizedBox(
-        width: 500,
-        height: 300,
-        child: Column(
-          children: <Widget>[
-            colorList(),
-            Expanded(
-              child: Padding(
-                padding: const EdgeInsets.symmetric(vertical: 12),
-                child: shadingList(),
-              ),
-            ),
-          ],
-        ),
-      );
-    }
-  }
-}

apps/weblibre/lib/features/geckoview/features/tabs/utils/color_palette.dart

@@ -17,117 +17,19 @@
  * 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:math';
-
 import 'package:flutter/material.dart';
+import 'package:material_color_utilities/material_color_utilities.dart';
 
-final _rnd = Random();
+const int _hueCount = 24;
+const double _seedChroma = 60.0;
+const double _seedTone = 60.0;
 
-/// Check if is good condition to use white foreground color by passing
+// Evenly spaced HCT hues. ColorScheme.fromSeed extracts the seed's hue and
-/// the background color, and optional bias.
+// normalizes tone, so spacing in HCT (not HSL) guarantees each swatch yields
-///
+// a perceptually distinct primaryContainer.
-/// Reference:
+final List<Color> containerSeedColors = List<Color>.unmodifiable(
-///
+  List.generate(_hueCount, (i) {
-/// Old: https://www.w3.org/TR/WCAG20-TECHS/G18.html
+    final hue = i * 360.0 / _hueCount;
-///
+    return Color(Hct.from(hue, _seedChroma, _seedTone).toInt());
-/// New: https://github.com/mchome/flutter_statusbarcolor/issues/40
+  }),
-bool useWhiteForeground(Color backgroundColor, {double bias = 0.0}) {
+);
-  // Old:
-  // return 1.05 / (color.computeLuminance() + 0.05) > 4.5;
-
-  // New:
-  final v = sqrt(
-    pow(backgroundColor.r, 2) * 0.299 +
-        pow(backgroundColor.g, 2) * 0.587 +
-        pow(backgroundColor.b, 2) * 0.114,
-  ).round();
-  return v < (130 + bias);
-}
-
-const List<List<Color>> colorTypes = [
-  [Colors.red, Colors.redAccent],
-  [Colors.pink, Colors.pinkAccent],
-  [Colors.purple, Colors.purpleAccent],
-  [Colors.deepPurple, Colors.deepPurpleAccent],
-  [Colors.indigo, Colors.indigoAccent],
-  [Colors.blue, Colors.blueAccent],
-  [Colors.lightBlue, Colors.lightBlueAccent],
-  [Colors.cyan, Colors.cyanAccent],
-  [Colors.teal, Colors.tealAccent],
-  [Colors.green, Colors.greenAccent],
-  [Colors.lightGreen, Colors.lightGreenAccent],
-  [Colors.lime, Colors.limeAccent],
-  [Colors.yellow, Colors.yellowAccent],
-  [Colors.amber, Colors.amberAccent],
-  [Colors.orange, Colors.orangeAccent],
-  [Colors.deepOrange, Colors.deepOrangeAccent],
-  [Colors.brown],
-  [Colors.grey],
-  [Colors.blueGrey],
-  [Colors.black],
-];
-
-List<Map<Color, String>> shadingTypes(List<Color> colors) {
-  final List<Map<Color, String>> result = [];
-
-  for (final Color colorType in colors) {
-    if (colorType == Colors.grey) {
-      result.addAll(
-        [
-          50,
-          100,
-          200,
-          300,
-          350,
-          400,
-          500,
-          600,
-          700,
-          800,
-          850,
-          900,
-        ].map((int shade) => {Colors.grey[shade]!: shade.toString()}).toList(),
-      );
-    } else if (colorType == Colors.black || colorType == Colors.white) {
-      result.addAll([
-        {Colors.black: ''},
-        {Colors.white: ''},
-      ]);
-    } else if (colorType is MaterialAccentColor) {
-      result.addAll(
-        [
-          100,
-          200,
-          400,
-          700,
-        ].map((int shade) => {colorType[shade]!: 'A$shade'}).toList(),
-      );
-    } else if (colorType is MaterialColor) {
-      result.addAll(
-        [
-          50,
-          100,
-          200,
-          300,
-          400,
-          500,
-          600,
-          700,
-          800,
-          900,
-        ].map((int shade) => {colorType[shade]!: shade.toString()}).toList(),
-      );
-    } else {
-      result.add({Colors.transparent: ''});
-    }
-  }
-
-  return result;
-}
-
-Color randomColorShade(List<Color> colors) {
-  final color = colors[_rnd.nextInt(colors.length)];
-  final shades = shadingTypes([color]);
-
-  return shades[_rnd.nextInt(shades.length)].keys.first;
-}

apps/weblibre/lib/features/geckoview/features/tabs/utils/container_colors.dart

@@ -18,6 +18,7 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 import 'package:flutter/material.dart';
+import 'package:material_color_utilities/material_color_utilities.dart';
 
 class ContainerColorPalette {
   const ContainerColorPalette({
@@ -65,8 +66,17 @@ class ContainerColorPalette {
 
 /// Centralized helper for container color display and theming.
 ///
-/// This class converts the stored container seed color into Material 3 roles
+/// Converts the stored container color into Material 3 roles used
-/// used consistently across the application.
+/// consistently across the application. Supports two modes:
+///
+/// - **Seed mode** (default): the color is treated as a seed and fed through
+///   [ColorScheme.fromSeed], yielding an M3-harmonized palette. The actual
+///   container background depends on the theme brightness (T90 light / T30
+///   dark) — picking a dark seed does not produce a dark container.
+/// - **Custom mode** (`useCustomColor: true`): the color is used directly as
+///   `primaryContainer`. Accent/outline are derived via HCT tone shifts and
+///   on-colors via WCAG contrast. Enables true any-color choice (including
+///   black/dark grey) at the cost of strict M3 harmonization.
 class ContainerColors {
   ContainerColors._();
 
@@ -74,55 +84,100 @@ class ContainerColors {
   static const double surfaceHighAlpha = 0.28;
   static const double outlineBorderAlpha = 0.5;
 
-  static ContainerColorPalette palette(BuildContext context, Color seedColor) {
+  static ContainerColorPalette palette(
+    BuildContext context,
+    Color color, {
+    bool useCustomColor = false,
+  }) {
     final theme = Theme.of(context);
     final appScheme = theme.colorScheme;
-    final containerScheme = ColorScheme.fromSeed(
+    final fullColor = fullOpacity(color);
-      seedColor: fullOpacity(seedColor),
+
+    final containerColor = useCustomColor
+        ? fullColor
+        : ColorScheme.fromSeed(
+            seedColor: fullColor,
             brightness: theme.brightness,
-    );
+          ).primaryContainer;
+    final accentColor = useCustomColor
+        ? _shiftTone(fullColor, theme.brightness)
+        : ColorScheme.fromSeed(
+            seedColor: fullColor,
+            brightness: theme.brightness,
+          ).primary;
+    final onContainerColor = useCustomColor
+        ? _contrastingForeground(containerColor)
+        : ColorScheme.fromSeed(
+            seedColor: fullColor,
+            brightness: theme.brightness,
+          ).onPrimaryContainer;
+    final onAccentColor = useCustomColor
+        ? _contrastingForeground(accentColor)
+        : ColorScheme.fromSeed(
+            seedColor: fullColor,
+            brightness: theme.brightness,
+          ).onPrimary;
+
     final surfaceColor = Color.alphaBlend(
-      containerScheme.primaryContainer.withValues(alpha: surfaceAlpha),
+      containerColor.withValues(alpha: surfaceAlpha),
       appScheme.surfaceContainer,
     );
     final surfaceHighColor = Color.alphaBlend(
-      containerScheme.primaryContainer.withValues(alpha: surfaceHighAlpha),
+      containerColor.withValues(alpha: surfaceHighAlpha),
       appScheme.surfaceContainerHighest,
     );
-    final outlineColor = containerScheme.primary.withValues(
+    final outlineColor = accentColor.withValues(alpha: outlineBorderAlpha);
-      alpha: outlineBorderAlpha,
-    );
 
     return ContainerColorPalette(
-      accentColor: containerScheme.primary,
+      accentColor: accentColor,
-      onAccentColor: containerScheme.onPrimary,
+      onAccentColor: onAccentColor,
-      containerColor: containerScheme.primaryContainer,
+      containerColor: containerColor,
-      onContainerColor: containerScheme.onPrimaryContainer,
+      onContainerColor: onContainerColor,
       surfaceColor: surfaceColor,
       surfaceHighColor: surfaceHighColor,
       outlineColor: outlineColor,
       backgroundColor: surfaceColor,
-      selectedBackgroundColor: containerScheme.primaryContainer,
+      selectedBackgroundColor: containerColor,
       borderSide: BorderSide(color: outlineColor),
       selectedBorderSide: const BorderSide(color: Colors.transparent),
       foregroundColor: appScheme.onSurfaceVariant,
-      selectedForegroundColor: containerScheme.onPrimaryContainer,
+      selectedForegroundColor: onContainerColor,
-      badgeBackgroundColor: containerScheme.primary,
+      badgeBackgroundColor: accentColor,
-      badgeForegroundColor: containerScheme.onPrimary,
+      badgeForegroundColor: onAccentColor,
-      avatarColor: containerScheme.primary,
+      avatarColor: accentColor,
-      selectedAvatarColor: containerScheme.onPrimaryContainer,
+      selectedAvatarColor: onContainerColor,
       avatarBackgroundColor: surfaceHighColor,
-      avatarForegroundColor: containerScheme.primary,
+      avatarForegroundColor: accentColor,
     );
   }
 
   /// Returns the full opacity version of a container color.
-  ///
-  /// Useful when you need the original color for comparison or display
-  /// in contexts where full opacity is needed.
-  ///
-  /// [baseColor] The color to ensure has full opacity
   static Color fullOpacity(Color baseColor) {
     return baseColor.withValues(alpha: 1.0);
   }
+
+  /// Shifts the color in HCT to a tone suitable for use as an accent against
+  /// the theme surface. Light theme uses T40 (darker); dark theme uses T80
+  /// (lighter). Mirrors M3's primary tone targets.
+  static Color _shiftTone(Color color, Brightness brightness) {
+    final hct = Hct.fromInt(color.toARGB32());
+    final targetTone = brightness == Brightness.light ? 40.0 : 80.0;
+    return Color(Hct.from(hct.hue, hct.chroma, targetTone).toInt());
+  }
+
+  /// Picks whichever of black or white has higher contrast against
+  /// [background].
+  static Color _contrastingForeground(Color background) {
+    final blackContrast = _contrastRatio(background, Colors.black);
+    final whiteContrast = _contrastRatio(background, Colors.white);
+    return blackContrast >= whiteContrast ? Colors.black : Colors.white;
+  }
+
+  static double _contrastRatio(Color a, Color b) {
+    final aLuminance = a.computeLuminance();
+    final bLuminance = b.computeLuminance();
+    final lighter = aLuminance > bLuminance ? aLuminance : bLuminance;
+    final darker = aLuminance > bLuminance ? bLuminance : aLuminance;
+    return (lighter + 0.05) / (darker + 0.05);
+  }
 }

apps/weblibre/lib/presentation/widgets/url_list_tile.dart

@@ -28,6 +28,7 @@ class UrlListTile extends StatelessWidget {
   final Widget? leading;
   final Widget? trailing;
   final Color? containerColor;
+  final bool useCustomColor;
   final bool showHttpScheme;
   final VoidCallback? onTap;
 
@@ -38,6 +39,7 @@ class UrlListTile extends StatelessWidget {
     this.leading,
     this.trailing,
     this.containerColor,
+    this.useCustomColor = false,
     this.showHttpScheme = true,
     this.onTap,
   });
@@ -50,7 +52,11 @@ class UrlListTile extends StatelessWidget {
     final textTheme = Theme.of(context).textTheme;
     final colorScheme = Theme.of(context).colorScheme;
     final containerPalette = containerColor != null
-        ? ContainerColors.palette(context, containerColor!)
+        ? ContainerColors.palette(
+            context,
+            containerColor!,
+            useCustomColor: useCustomColor,
+          )
         : null;
 
     return Container(