Using niche browser forks is often not a good idea. These are extremely fast moving projects that need to constantly be updated to stay secure.
This is especially true for Firefox forks, as Firefox allows you to customize it to the point that it is almost the same as many of these forks.
There are exceptions to this - for example, LibreWolf has a fairly good track record and Mullvad Browser needs to fork Firefox to (try) ensure all users have the same fingerprint.