It's strange hearing reports of "scroll lag" in the other comments. It's possible I'm just lucky. Or there's a misconfiguration somewhere in their setup that Chrome somehow avoids.
It's true that I still mostly use Chrome for webdev - I've become more used to it's (excellent) dev tools, even though Firefox and Firebug started that whole trend. It feels very right to separate my "user browser" from my "dev browser" in this way!
I find this very common with Credit Card and Banking Sites. Very often they either refuse to log me in or log me out sooner than they should on Firefox, or certain pages within the site will just not load. I'm guessing they prioritize security, and only test this stuff in Chrome ;(
Reddit.com and Discord have replaced many individual forums.