As much as I hate Firefox having AI, they really don't have a choice. If the majority of people are already using it and don't give a rats ass, they're absolutely gonna switch to the AI integrated browsers ( chrome, edge, probably safari if they already have AI in it or are working on it, etcetera ).
Firefox is inbetween a rock and a hard place right now. They either not add AI integration and attract less users or they do and risk alienating their current small userbase and becoming irrelevant enough to become unusable because big tech 100% enforces a new web standard that non-AI Firefox cannot handle.
For now, I'm siding with Mozilla on this because I can almost 100% guarantee if Firefox falls, the free web will die in less than a year. No more Librewolf, Firedragon ( floorp w/ Librewolf settings/patches IIRC ), etcetera, because if we're being honest, what open source company/rando volunteer has the time, drive, and money to keep the Gecko rendering engine alive? And that's just a start to keeping Firefox alive.