From my perspective, Firefox, a while back, just stopped working on issues that matter. They got into politics, they tried to do everything, but not as good.
If they just focused to produce a good browser, they would be way ahead. And time when you could get $100Ms from Google are slowly coming to an end. Money attracts grifters and this is what brought them down from my perspective.
Now, just to be honest, I wish they find a way. We always could use alternatives. Just don't expect this alternative to come from Mozilla.
I've never understood their massive activism arm, it's always seemed bloated and ineffective compared to organizations I donate money to like the EFF