There's a switch, it's that simple.
I'm willing to bet my ass that if they didn't offered AI at all, half of the community would complain they're missing the boat or something.
The world is currently rule by a bunch of pedo-oligarchs, can't we just stop complaining about the smallest things and appreciate the fact that we still have a strong alternative to chromium and Google browser? Mozilla isn't perfect but it isn't the bad guy.