I think they're damned if they do ("who the fuck wants AI in everything") and damned if they don't ("Mozilla is so irrelevant they didn't even tried the AI race")
It's a browser. A browser does not need AI baked in. Extensions/addons? Sure, go for it, the more the merrier. But forcing it on people was always going to be a daft move, especially for Mozilla who have completely lost their whole "We're not as bad as Google" schtick over the last few years.
