Mozilla has decided to disable the checkbox to stop checking for updates. About:config options don't disable the prompt to update either. Those would be the following:
// Disable updater
lockPref("app.update.enabled", false);
// make absolutely sure it is really off
lockPref("app.update.auto", false);
lockPref("app.update.mode", 0);
lockPref("app.update.service.enabled", false);
No longer works entirely.
It appears that I can change this setting and it will work:
app.update.url;https://aus5.mozilla.org/update/6/%PRODUCT%/%VERSION%/%BUILD_ID%/%BUILD_TARGET%/%LOCALE%/%CHANNEL%/%OS_VERSION%/%SYSTEM_CAPABILITIES%/%DISTRIBUTION%/%DISTRIBUTION_VERSION%/update.xml
change to
lockPref("app.update.url", "https://localhost");
You can also delete the updater.app that resides within the Firefox.app.
However, what are you guys doing? I leaning towards redirecting the app.update.url.
Edit: Fixed a type and have confirmed that the app.update.url change does resolve the problem. Going with that.
