diff --git a/launch.html b/launch.html
index 1859f60..d4cc55a 100644
--- a/launch.html
+++ b/launch.html
@@ -1660,9 +1660,11 @@
         );
       }
 
+      const ANDROID_APP_SCHEME = "org.jitsi.meet://";
+
       function createAndroidAppUrl(room) {
         return (
-          "org.jitsi.meet://" +
+          ANDROID_APP_SCHEME +
           CONFIG.jitsiHost +
           "/" +
           encodeURIComponent(room)
@@ -1875,9 +1877,16 @@
 
         /*
          * Protocol Handler starten.
+         *
+         * Firefox ignoriert externe Protokolle aus iframes –
+         * das Custom-Schema direkt in der Hauptnavigation starten.
          */
         try {
-          iframe.src = protocolUrl;
+          if (protocolUrl.startsWith(ANDROID_APP_SCHEME)) {
+            window.location.href = protocolUrl;
+          } else {
+            iframe.src = protocolUrl;
+          }
         } catch (error) {
           console.error(
             "Error opening the Jitsi Protocol Handler:",