fix unmounted exception

app/lib/features/geckoview/features/browser/domain/providers.g.dart

@@ -706,7 +706,7 @@ final class FilteredTabPreviewsProvider
 }
 
 String _$filteredTabPreviewsHash() =>
-    r'f2958369b4270f4c8165526c0ffad22f41ec0491';
+    r'9fbf6774433e62ce9b63ef66f6db3446e6182109';
 
 final class FilteredTabPreviewsFamily extends $Family
     with

app/lib/features/geckoview/features/tabs/domain/providers/selected_container.dart

@@ -164,14 +164,18 @@ Stream<ContainerData?> selectedContainerData(Ref ref) {
 }
 
 @Riverpod()
-AsyncValue<int> selectedContainerTabCount(Ref ref) {
+Future<int> selectedContainerTabCount(Ref ref) async {
   final selectedContainer = ref.watch(selectedContainerProvider);
-  final tabCount = ref.watch(
+
-    containerTabCountProvider(
+  if (selectedContainer == null) {
+    return 0;
+  }
+
+  // Use selectAsync to avoid UnmountedRefException when container changes
+  return ref.watch(
+    watchContainerTabIdsProvider(
       // ignore: provider_parameters
       ContainerFilterById(containerId: selectedContainer),
-    ),
+    ).selectAsync((tabs) => tabs.length),
   );
-
-  return tabCount;
 }

app/lib/features/geckoview/features/tabs/domain/providers/selected_container.g.dart

@@ -106,9 +106,8 @@ String _$selectedContainerDataHash() =>
 const selectedContainerTabCountProvider = SelectedContainerTabCountProvider._();
 
 final class SelectedContainerTabCountProvider
-    extends
+    extends $FunctionalProvider<AsyncValue<int>, int, FutureOr<int>>
-        $FunctionalProvider<AsyncValue<int>, AsyncValue<int>, AsyncValue<int>>
+    with $FutureModifier<int>, $FutureProvider<int> {
-    with $Provider<AsyncValue<int>> {
   const SelectedContainerTabCountProvider._()
     : super(
         from: null,
@@ -125,22 +124,14 @@ final class SelectedContainerTabCountProvider
 
   @$internal
   @override
-  $ProviderElement<AsyncValue<int>> $createElement($ProviderPointer pointer) =>
+  $FutureProviderElement<int> $createElement($ProviderPointer pointer) =>
-      $ProviderElement(pointer);
+      $FutureProviderElement(pointer);
 
   @override
-  AsyncValue<int> create(Ref ref) {
+  FutureOr<int> create(Ref ref) {
     return selectedContainerTabCount(ref);
   }
-
-  /// {@macro riverpod.override_with_value}
-  Override overrideWithValue(AsyncValue<int> value) {
-    return $ProviderOverride(
-      origin: this,
-      providerOverride: $SyncValueProvider<AsyncValue<int>>(value),
-    );
-  }
 }
 
 String _$selectedContainerTabCountHash() =>
-    r'0fd457793f7870050f81c54d2fbcc81aca60f394';
+    r'36efadeaa356e34cfdb6c07dbba73eed6d2ad6ca';