Also from Jamie Zawinski yesterday: Mozilla's Original Sin
Some will tell you that Mozilla's worst decision was to accept funding from Google, and that may have been the first domino, but I hold that implementing DRM is what doomed them, as it led to their culture of capitulation. It demonstrated that their decisions were the decisions of a company shipping products, not those of a non-profit devoted to preserving the open web.
Those are different things and are very much in conflict. They picked one. They picked the wrong one.
The Mullvad Browser is the Tor Browser without Tor, that is, it's a Firefox-based browser with lots of privacy and anonymity improvements, but without the Tor network layer. Mullvad actually sponsored the Tor project in return for some help getting it done, or something along those lines.
As far as I understand (I'm not super familiar with LibreWolf), Mullvad fork should be "better" in that regard.