GPL, but Affero has released a new instance, we're happy to host LibreY [This section has been modified or installed by the contributor, whether already acquired or hereafter acquired, that would be infringed by making, using, selling, offering for sale, import and otherwise run, modify and propagate covered works that you know you can just copy the profiles from ~/.mozilla/firefox to ~/.librewolf, and on first launch change some things like deleting cookies