

As far as I know, no it isn’t.
My recommendation is that if you want better browser privacy than Librewolf, look into Pale Moon or GNU IceCat which are independently maintained older forks of Firefox (and thus untouched by the plague that is Mozilla). Use uMatrix and JShelter. You can also read these articles on browser privacy. Although many of these articles haven’t been updated in a while, most are still relevant.
It appears that I was mistaken. After looking through Mullvad’s documentation, it truly appears that it has really good fingerprinting protection.
The downsides I see with Mullvad Browser:
Sure, you could argue that these automatic connections are necessary and they are to trusted sites but you are still dealing with telemetry which should be disabled by default.
Nevertheless thank you for enlightening me. I will definetly now try out Mullvad Browser to replace Arkened Firefox.