While problematic, yeah, I’d dispute that as Firefox’s market share problem.
Users like you and me, who are even aware of projects like Waterfox, are a minuscule, vanishing minority. We aren’t switching to Chrome anyway. But we aren’t representative of the web’s user base.
And if most Chrome users were sick of the Gemini spam… they’d have already switched to Firefox, where it’s toggleable and an order of magnitude less in-your-face. But they aren’t.
Same with Manifest V3. They neutered UBlock on Chrome long ago, yet that’s clearly not dissuading most Chrome users.
In short, if in-your-face-AI was a dealbreaker for most, Chrome wouldn’t be gaining market share.