I have trouble using firefox-language-packs in a guest-account-scenario. The language-extensions are disabled after logging in. In extension.json they are enabled. I have asked here, too, but did not receive an answer: https://forums.linuxmint.com/viewtopic.php?t=431196

I suppose the problem is a "first run problem" because the name of the guest-account / the guest-account is created everytime a user loggs in as guest.

Thanks a lot for every hint.

Martin