I don't know what Mozilla means by "AI browser", but one would assume it means more than "regular browser with an optional chat bot sidebar". I don't wanna figure out what it means, I don't wanna use anything that could fairly be described as an "AI browser".
Fwiw, I don't use the AI sidebar. I'd have forgotten it existed if HN didn't bring it up as if it's shoved in your face like some chatbot in an IDE. But I guess if it was the latter people wouldn't be angry