Get back in touch with your users. Stop chasing other browsers - I left them for a reason 15+ years ago.
Every new feature from the latest release, I disabled immediately. I hate my UI changing, at least we had about:config options this time.
We have to use CSS-tricks to fix your UI every other release.
I don't have a Firefox account and will never have one. I do not want to log in to my browser. Give me the dumbest, most HTML compatible browser with a few add-ons and we are set for the next decade. You are wasting time and money, which is all donated to you. Stop!