It's a purity race to oblivion : people who know and care use Firefox. They switched away from the default and by that very action they are in the tiny minority who actually has a grasp at problems and dare try to do something about. They are vocal about it, put efforts into the process so they in general want "more" and "better" according to their own criteria. It doesn't stop there though, once they have moved away for privacy or open source or sovereignty or whatever else, they want the other criteria and it won't stop.

It is recursive though, people who care a lot about some criteria move away from Firefox, the now "mainstream" within that community, then use e.g. Waterfox or LibreWolf. You can see this in any community which moves away from the mainstream choice really. There is a vocal minority within the minority and they do have genuine reasons and concern.

Once you use LibreWolf I bet there are other forks, etc, etc.

For those people what Firefox is doing is actually very bad because it goes back to what they wanted to move away from.