What is the difference between Mullvad Browser and LibreWolf?

No. Don’t use Librewolf or Arkenfox for fingerprinting. If you want to be anonymized, use Tor browser or Mullvad Browser + VPN. They simply have different purposes. Mullvad Browser is not made to log in into website and should not be used for that (until a persistent mode comes out, I’m presuming with the Firefox profiles, we shall see). I use 3 browsers btw. When profiles will roll out in Firefox, I will probably use only 2.

I didn’t know a wiki for Librewolf even existed. For Arkenfox you have to read the wiki to use it. And not only go through the wiki, but understand what each config does: arkenfox gui

I agree, but once in maintenance mode, there are no headaches. I also have a NAS. My point still stands.