I use the extension 'Tab Mix Plus' When they went to version 4.0.X , one of the functions was discontinued. I contacted them and they say there will be no change. I load an earlier version, but periodically it auto updates. I can reload it but this repeats. I have check the box for 'Check for updates, but let me choose...', but this does not work for updates of addons. Is there a manual way in 'about:config' that I can stop the auto update.