It does the thing it's supposed to do. Still Extension Manager (flatpak) is the best way to get extensions. No clue if this add-on will see future updates or no?

Firefox Snap on Ubuntu 22.10 and its working fine. Thx all

More info here… https://discourse.ubuntu.com/t/call-for-testing-native-messaging-support-in-the-firefox-snap/29759/108

Can't use with firefox install by flastpak