use stack instead of visibility

app/lib/features/geckoview/features/browser/presentation/widgets/browser_modules/browser_view.dart

@@ -218,11 +218,9 @@ class _BrowserViewState extends ConsumerState<BrowserView>
       },
     );
 
-    return Visibility(
+    return Stack(
-      visible: hasTab,
+      children: [
-      maintainState: true,
+        GeckoView(
-      replacement: SizedBox.expand(child: Container(color: Colors.grey[800])),
-      child: GeckoView(
           preInitializationStep: () async {
             await ref
                 .read(eventServiceProvider)
@@ -283,6 +281,11 @@ class _BrowserViewState extends ConsumerState<BrowserView>
             }
           },
         ),
+        if (!hasTab)
+          Positioned.fill(
+            child: SizedBox.expand(child: Container(color: Colors.grey[800])),
+          ),
+      ],
     );
   }