Integration between Linux app and Snap Firefox

HeuvelTop I'd say first thing to try is just to uninstall and reinstall the plugin (making sure you have your secret key, 2FA and password handy). If that doesn't work, try creating a new firefox profile (eg. firefox -P) and install just 1Password.. Does it work? If so, can gradually introduce back the other plugins you find until you find culprit. Then adapt your normal profile accordingly.

You can run multiple firefox windows in different profiles with "firefox --no-remote -P" ... so you could have your normal and test profiles side by side (would recommend not logging into firefox account in test profile).