The problem I see with Tor in many countries is that it's very hard to avoid being victimized for it. Something unrelated happens in your area, and you get instant suspicion, a knock on your door, harassment, etc. Has not happened to me personally because I do not use Tor, but I have witnessed it.
I've heard suggestions to live in a Tor-only commune of dozens or hundreds for safety / anonymity in a crowd, but it's very impractical for most.
Seems like the mullvad browser is trying to advertise itself as the missing middle? Not as extreme as Tor, not as basic as vanilla Firefox?
I'm having trouble distinguishing Librewolf from Mullvad browsers myself, although I am not very knowledgeable.