Is Firefox or Mozilla perfect? Heck no. But we're not comparing Mozilla against pre-IBM Red Hat or Ben & Jerry's or whatever your concept of the ideal corporate citizen is. We're comparing Mozilla against Google. That's a very low bar that Mozilla clears with ease, especially if you're criteria includes shoving AI down your throat.
Firefox is no longer part of most browser compatibility matrices, what ease?
Either way we're still stuck with it.
I'm not sure Mozilla clears it. Zen or Librewolf or PaleMoon clears it.