I'm confused.
What does this browser do differently than Librewolf? Based off of Tor Browser...without Tor? So it's essentially the Tor Browser without what makes the Tor Browser stand out? Supposed to use a VPN instead? Am I missing something? Who is this for?
One of the important features of the Tor Browser is that there's a collection of users who all use the same Browser to access the same resources. The "herd" mentality or homogeny is the reason the Tor Project recommends the Tor Browser. It's because if nothing else, you have a ton of users who have the same exact setup so extensive fingerprinting would be harder to achieve.
This browser currently has a less active userbase, based on the Tor Browser which is based on Firefox with its issues, packages two extensions out of the box, Mullvad's extension I'm not convinced should be included be default (IMO, uBlock Origin should be integrated within the browser like Brave's Adblock), so unless I'm missing something, what does this offer an end user that someone with a VPN and Brave (or Librewolf) cannot achieve?