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jwz: Mozilla is an advertising company now
(www.jwz.org)
A place to discuss the news and latest developments on the open-source browser Firefox
I’m not a security expert, but I think it’s roughly on-par with LibreWolf. I think they both come without Encrypted Media Extensions.
https://mullvad.net/en/browser/hard-facts
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.