Not worth the risk Rated 2 out of 5 stars
Recently I had a system crash and FF28 stopped restoring the last session or allowing the layout to be customized. By systematically disabling addons I managed to narrow the problem down to this addon. Reinstalling it solved the problem however the risk of this happening again is not worth it. I had the Firefox button in the navbar when it happened, it is probably wise to leave the button in its default location.