Ungoogled chromium is just brave without all the privacy benefits, mullvad browser is just tor browser without tor, which might be useful in some cases if you are using multiple browsers but I wouldn’t main it , and it has the same problems as librewolf

Yes, librewolf is un-mozillad firefox but it also turns on many privacy features by default. Many sites need exceptions to work properly which takes a little getting used to. After using FF for decades librewolf was an easy switch.