added support for overriding locales

app/lib/features/geckoview/features/preferences/data/repositories/preference_observer.dart

@@ -25,8 +25,6 @@ class PreferenceChangeListener extends _$PreferenceChangeListener {
 @Riverpod()
 class PreferenceFixator extends _$PreferenceFixator {
   Future<void> register(String name, Object value) async {
-    await GeckoPrefService().applyPrefs({name: value});
-
     state = {...state}
       ..update(
         name,
@@ -36,6 +34,8 @@ class PreferenceFixator extends _$PreferenceFixator {
           return value;
         },
       );
+
+    await GeckoPrefService().applyPrefs({name: value});
   }
 
   Future<void> unregister(String name) async {

app/lib/features/geckoview/features/preferences/data/repositories/preference_observer.g.dart

@@ -87,7 +87,7 @@ final class PreferenceFixatorProvider
   }
 }
 
-String _$preferenceFixatorHash() => r'dfa323859c660d3db74dba7297e2a33b758ed78a';
+String _$preferenceFixatorHash() => r'c76245d5c420e2e3f6c026f23c017c939b69ef59';
 
 abstract class _$PreferenceFixator extends $Notifier<Map<String, Object>> {
   Map<String, Object> build();