I don't use it because of mobile adblock only. There are multiple private chromium browsers which have mobile adblock, and also one supporting extensions : kiwi browser.
I use Firefox because it's a competing engine to chromium, and it looks good.
I also have all the synced bookmarks from my PC Firefox, which I use for the same reason, and because I got used to it.
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.