Sadly not everywhere. On mobile it lacks behind. Even more on video content and low power cpus.
Chromium is slightly better in a way where I could clic on the video buttons without lag : On my android TV, (sideloaded) Firefox had issues with video buttons. So I tried using kiwi browser (for the extension support), and it worked well for buttons. The video wasn’t a lot smoother, but it just seemed maybe just slightly better.