I can understand the frustrations, Mozilla don't get everything right.

But personally I much prefer their ecosystem to Chromiums. Chormium is compromised by Google's control. The google driven Manifest V3 controversy around adblockers, and the FLoC privacy concerns are good examples of this.

Also there are only 3 major broswer engines left: Webkit, Blink and Gecko. Webkit and Blink are ultimately controlled & influenced by big tech corporations driven by commerical priorities including advertising, while Gecko is independent.

I'm not suggesting that is enough in itself. I do honestly personally like Firefox, but it certainly makes me much more forgiving of it when I consider the alternatives.