I've just switch from Chrome a week or two ago and most things are good, but LastPass is a major problem that might be a deal breaker.

Update: I went to https://lastpass.com/misc_download2.php and downloaded the Firefox extension from there. So far it seems better.

(Oddly, my prefs now say I have version 4.17.1.1, last updated 12/12/2018 (today) while the version listed in for download here is currently 4.18.1.2, last updated in October. And when I had it installed from here before, I'd swear it was 4.19. Go figure.)