There are two big error modes that we need to look out for when reacting in anger. First is to not jump from the frying pan into the fire by adopting a browser that makes nice sounding claims but really has no way to back them up. Installing a blob from a random website is never a good idea, especially when it's a browser. Personally, I think Librewolf is worth the risk but time may proved me wrong. The second error is a bit more subtle in that we need to think more deeply about how to fund browser development such that protects user interest. Clearly there are very powerful and pervasive market forces that Will attempt to warp any browser project into selling user data. That's true for all ubiquitous platform software, but the browser is particularly vulnerable because it exists at a high level of abstraction and therefore high level of utility. So I will make a prediction that the next successful privacy focused browser is going to be something like Cursor, a fork of a well-known browser engine with built-in local AI in service of the user only. This project will have to be a loss leader for another money making entity that requires a truly secure and private platform.
One of the browsers listed in GNU IceCat. They are one of the few organizations that can probably be trusted not to join the ad blob. So, that could be an interesting option.
GNU IceCat is still based on Firefox. Sure, it may remove tracking and some other sketchy stuff, but ultimately it's not a replacement for Firefox because if Firefox dies then GNU IceCat does as well.