Their android browser is kind of terrible. It's significantly more sluggish than chrome, bordering on unusable on some websites. Maybe there's a state of the art flagship phone out there somewhere that can run firefox android and see it perform well, but I've sure never seen it run well.
I have used ff on android with ublock for 5 years on an s20. It has been superb for me. The only complaint from me is that the bookmark page as "tile" doesnt work.
