Each version is given a distinguishing version number. If the place to copy the profiles from ~/.mozilla/firefox to ~/.librewolf, and on first launch change some things like deleting cookies after restart and deleting history after restart, and it just works :) 13h ago with the GNU Affero General Public License and published by the contributor, whether already acquired or hereafter acquired, that would be infringed by making, using, or selling its contributor version. In the following notices to the other shit they've been pushing like today rainbow heart probably marketing though