In Firefox, click the Open application menu icon , then select Add-ons and themes > Extensions. Click the Tools for all add-ons icon and disable ...
1. Click the menu button and select Options.Preferences. 2. In the General panel, scroll down to the Firefox Updates section. 3. Check Never check for updates.
Type “about:config” in the Firefox address bar then press “Enter“. Search for the app.update.auto setting. Double-click the “app.update.auto” option to toggle ...