Mozilla is having certificate problems and all(?) extensions have been deactivated. They say it was only on some machines but I think it is all machines. I saw mine shutdown a few hours ago.
https://www.zdnet.com/article/firefox-add-ons-disabled-en-masse-after-mozilla-certificate-issue/
https://www.zdnet.com/article/firefox-add-ons-disabled-en-masse-after-mozilla-certificate-issue/