FF mobile has mv2 support, as does its many forks.
Yes. I used Firefox on Android for a long time, but I was annoyed by the performance and inability to save page as MHTML (that's a very niche peeve).
Depending on how long ago that was, it might be worth checking back in with it. It had a complete rewrite a few years back and it's now just as good as chrome mobile - I use IronFox, but there are also a few other forks.