We have FF 30 deployed on our Windows 7 Desktop machines, we have setup an all-companies.js file in C:\Program Files (x86)\Mozilla Firefox\defaults\pref with the following values; user_pref("app.update.auto", false); user_pref("app.update.enabled", false); but these aren't being changed when checking about:config. We want to stop FF checking for updates as we apply in a controlled manner ourselves and don't want using being prompted about updates