I have used Firefox on android since 2018. I have never encountered a bug. Not a UI hiccup, not something doing something unexpected, not slowdowns, not crashing, not anything.

I routinely open links in the default android browser (chrome now), and it literally crumbles under the weight of ads in your average article, and then open it in firefox and uBlock means it runs great and any issue I was having disappears.

>I don't quite understand the appeal of Firefox

It's not chromium based, so Google can't force it to grow in the direction that only benefits their infrastructure like they do so much with chrome, and uBlock is a strictly better ad blocking system than anything I have ever used. I don't think Brave is independent, as they are beholden to the Chrome team's architectural decisions and design goals. It attempts to send less tracking information to people tracking me (with a caveat that Mozilla themselves do a little first party tracking and advertising, which I consider morally less wrong than Google's entire business), and is not incentivized to make the web a worse place for the sole purpose of increasing Google's share price.