diff --git a/assets/launch.js b/assets/launch.js
index f27a78f..3c7cec4 100644
--- a/assets/launch.js
+++ b/assets/launch.js
@@ -12,6 +12,20 @@
 let CONFIG = {};
 const CONFIG_URL = "assets/config.json";
 
+/*
+ * localStorage is scoped per origin, not per path.
+ * Prefix keys with the app directory so parallel
+ * instances (e.g. meet.bnvb.eu/i and /p) stay
+ * independent.
+ *
+ * "/p/launch.html" becomes "/p/"
+ */
+const STORAGE_PREFIX =
+  window.location.pathname.replace(/[^/]*$/, "");
+
+const LANGUAGE_KEY = STORAGE_PREFIX + "jitsiLauncherLanguage";
+const THEME_KEY = STORAGE_PREFIX + "jitsiLauncherTheme";
+
 /* ============================================================
  * Translations
  * ============================================================
@@ -34,7 +48,7 @@ function detectLanguage() {
    * Saved language choice takes precedence.
    */
   try {
-    const saved = localStorage.getItem("jitsiLauncherLanguage");
+    const saved = localStorage.getItem(LANGUAGE_KEY);
 
     if (saved && TRANSLATIONS[saved]) {
       return saved;
@@ -179,7 +193,7 @@ function setLanguage(language) {
   translation = TRANSLATIONS[language];
 
   try {
-    localStorage.setItem("jitsiLauncherLanguage", language);
+    localStorage.setItem(LANGUAGE_KEY, language);
   } catch (error) {
     /*
      * localStorage can be blocked, e.g. in private mode.
@@ -225,8 +239,6 @@ function closeNavMenu() {
  * ============================================================
  */
 
-const THEME_KEY = "jitsiLauncherTheme";
-
 function savedTheme() {
   try {
     const saved = localStorage.getItem(THEME_KEY);