I talked about LibreWolf last month, and how I made profile-sync-daemon work.
The way I did made Firefox stop working, so this is the better way.
Fixing what I did and set it correctly:
sudo mv /usr/share/psd/browsers/firefox_bck /usr/share/psd/browsers/firefox
sudo cp /usr/share/psd/browsers/firefox /usr/share/psd/browsers/librewolf
Replacing .mozilla/firefox with .librewolf in /usr/share/psd/browsers/librewolf and restart psd.
sudo vi /usr/share/psd/browsers/librewolf
systemctl --user stop psd.service
systemctl --user start psd.service
psd p