Firefox should really double down on this. All this strict privacy protection could be branded as Firefox Pro and they could charge for it. This would make for a nice revenue stream as more and more people begin to see the value of this. If Hey can do it for email, Firefox Pro Can do it for browsers!
Counterpoint: this would destroy Firefox' credibility.
I use Firefox because of their strong pro-privacy stance. If they started charging for "real" privacy, it would damage that image - "privacy for those who can afford it" would be a bad slogan.
Also, Firefox has made it clear that they don't want our money, as seen in their continuous refusal to accept donations.