I tried yet most common steps:
installed the addon and gnome-browser-connector, linked ~/.mozilla/native-messaging-hosts into ~/librewolf/, but still get No such native application org.gnome.chrome_gnome_shell on gnome extensions page. Any clues how to get it work?
Just in case: if you installed LibreWolf from Flatpak, it won’t work. There is an opened issue for that in Flatpak (https://github.com/flatpak/xdg-desktop-portal/issues/655).