I use Brave browser, which on desktop is a little slow, but on mobile is just a Chromium fork with some extra privacy features (including ad blocking). I'd certainly like to support Firefox in principle, but Brave is a good substitute.
Oh, good, I thought you were trading a bit of janky scrolling for an ad infested web :) I've never noticed the scrolling issue specific to Firefox but I feel like everything on Android has a few hiccups like that. I've always chalked it up to JVM garbage collection. I'd be surprised if Brave didn't have a few UI quirks too.
Edit: Just read your other reply, I thought you meant frame skips or something. I don't hit many long pages on mobile so I've never realized it did what you were describing. I wonder if they even know about it.