[fenix] For https://github.com/mozilla-mobile/fenix/issues/16442 - Check if fragment is still attached before updating site permissions rules (https://github.com/mozilla-mobile/fenix/pull/16954)

app/src/main/java/org/mozilla/fenix/browser/BaseBrowserFragment.kt

@@ -86,6 +86,7 @@ import org.mozilla.fenix.HomeActivity
 import org.mozilla.fenix.IntentReceiverActivity
 import org.mozilla.fenix.NavGraphDirections
 import org.mozilla.fenix.OnBackLongPressedListener
+import org.mozilla.fenix.addons.runIfFragmentIsAttached
 import org.mozilla.fenix.R
 import org.mozilla.fenix.browser.browsingmode.BrowsingMode
 import org.mozilla.fenix.browser.readermode.DefaultReaderModeController
@@ -636,7 +637,9 @@ abstract class BaseBrowserFragment : Fragment(), UserInteractionHandler,
             context.settings().setSitePermissionSettingListener(viewLifecycleOwner) {
                 // If the user connects to WIFI while on the BrowserFragment, this will update the
                 // SitePermissionsRules (specifically autoplay) accordingly
-                assignSitePermissionsRules()
+                runIfFragmentIsAttached {
+                    assignSitePermissionsRules()
+                }
             }
             assignSitePermissionsRules()