Mullvad browser exists to advertise a VPN.
I would not recommend the latter in lieu of the former.
See this response from the mullvad-browser developer on exactly this:
> There are two main reasons, one which you preemptively answered:
> - the privacy model is about having a same fingerprint per platform for Mullvad Browser users, so you're not uniquely identifiable (which will be the case by following privacy hardening guides) > - it is much easier to recommend to user a browser pre-configured for an optimal privacy: some users will want to tinker, but if you don't have the time or knowledge, it's hard to do the right thing
> There are also more differences than "just a fork of Firefox", I encourage you to read the following page which goes more into the details: https://mullvad.net/en/browser/hard-facts
source: https://github.com/mullvad/mullvad-browser/issues/1
A librewolf contributor and arkenfox developer chimes in as well stating that it's no competition that mullvad-browser is more secure here:
https://github.com/mullvad/mullvad-browser/issues/1#issuecom...
So as much as I despise companies putting low effort into software rebrands that offer no value, all the facts point towards that very much not being the case here.
Edit: However https://privacytests.org/ shows mullvad-vpn and librewolf as being very similar wrt privacy.
Use a browser for browsing, e.g. firefox with a tons of plus is, from ublock, noscript and a dozen others and use a main browser like chrome for banking and some other stuff. Don't use a minor browser (opera, vivaldi etc.) for banking.