Its the best browser for privacy that doesn’t use tor. It has the capability of fooling naive scripts but also may have some protection against stronger fingerprinting methods since you blend in with a crowd.

Personally I prefer arkenfox because I dislike letterboxing, want sync, want to have control over my user overrides. Disabling these things in mullvad will likely make me stand out. IMO if your threat model is that high I would just use tor and a hardened FF or brave for normal use. All individual preferences though.