Addon settings and search engines customized over the past few years - just gone entirely with no way to restore. And for what? A browser with removed features (such as save page as pdf) and a trendy new UI. It took infuriatingly long to figure out how to downgrade back to classic Fennec, but that didnt bring my settings back. Also upgrading logged me out of my Firefox account. It might as well be a completely different browser, except it pretends to be Fennec after stabbing the real Fennec and leaving it to die in a back alley. Horrible development practices. It's not normal having to worry about losing all your shit when you update an app!