There may be GNOME specific issues as well but I also noticed the other week FF scrolling being bonkers in sway (just a light swipe can "smooth scroll" across s

There may be GNOME specific issues as well but I also noticed the other week FF scrolling being bonkers in sway (just a light swipe can "smooth scroll" across several screenfulls way too fast and long, with several seconds of slow trailing scrolling) but not under i3 (IIRC it might even have been fine in sway when running under XWayland). I don't recall the details but got back to somewhat sane behavior with some non-obvious about:config changes.