Being honest? I use Edge or Brave over Firefox because of compatibility edge cases and battery life. And while Mozilla might be the least bad browser vendor, they're not exactly great and dependent on Google for funding.
The edge case compat issues are rare for me, battery life seems the same, and FF is otherwise such a good, fast browser with nice extensions... I like it a lot more than Chrome now
I don't understand the "dependent on Google funding" statement that everyone mentions. Yeah, they're Google's bitch. But for what purpose? To act independently and make their own decisions, otherwise Google has a monopoly and they're screwed.
No, Mozilla's purpose is to appear to act independently while never doing anything that would upset Google too much. This incentive works even without Google ever even hinting at the funds being conditional on Mozilla being their bitch - someone who makes 3 million a year from a failing browser is not going to risk that setup.