If a lot of non-Mullvad users use it, it will create a nice pool of people with at least the same browser fingerprint.
Basically, it seems like a good choice if you are already a Mullvad user and your threat model does not require the use of a Tor browser. However, if there's a significant non-Mullvad user base using it, it won't do much, as you'll just stand out as the only person using the Mullvad browser without Mullvad VPN.
Basically, it seems like a good choice if you are already a Mullvad user and your threat model does not require the use of a Tor browser. However, if there's a significant non-Mullvad user base using it, it won't do much, as you'll just stand out as the only person using the Mullvad browser without Mullvad VPN.