#1 - Stop auto-updating Firefox. It often breaks things. Before you do an update, you want to save a backup, in case you have to roll back. #2 - Install the new version of Firefox in parallel with the old version. #3 - Install https://github.com/TiddlyWiki/TiddlyFox/raw/master/tiddlyfox.xpi . Install it from this location. That gets updated faster than the one on the Mozilla repository.