diff --git a/docker-compose.firefox.yml b/docker-compose.firefox.yml
index c4130b2..7a56ddd 100644
--- a/docker-compose.firefox.yml
+++ b/docker-compose.firefox.yml
@@ -14,6 +14,12 @@ services:
     - PUID=1000
     - PGID=1000
     - TZ=Europe/Berlin
+    - LANG=de_DE.UTF-8
+    - KEEP_APP_RUNNING=1
+    - DARK_MODE=1
+    - WEB_AUDIO=1
+    - SECURE_CONNECTION=1
+    - WEB_AUTHENTICATION=1
     ports:
     - "5800:5800"
     networks: