I made the switch soon after the Firefox improvements (Quantum?). Chrome was becoming so slow and unstable (OSX), and although there are many sites with Firefox compatibility issues (or at least I assume it's comparability) I haven't looked back. It kinda reminds me of the day way back in time when I first discovered Firefox and I was liberated from IE.

Thank you very much Firefox/Mozilla team!

edit: One of the "compatibility" issues I always have with Firefox are sites complaining about the adblocker I'm using. The thing is, I'm not. lol