I'm installing a Docker service set onto a new Ubuntu system, that has Firefox installed by default. One of the services is a GUI application. However, when opening Firefox for the first time, a dialog shows up that I would like to disable (attached). How can I disable this? I'm running Firefox using: "/usr/bin/firefox --kiosk http://localhost" I've already followed a lot of the suggestions in here: https://searchfox.org/mozilla-release/source/remote/shared/RecommendedPreferences.sys.mjs (and verified they are indeed set after installing my own "user.js" file), but I cannot find an about:config preference that disables what I'm still seeing. Any help or ideas?