hmmm, perhaps it's a Firefox bug..... https://www.ghacks.net/2019/05/04/your-firefox-extensions-are-all-disabled-thats-a-bug/ The issue can only be resolved on Mozilla's end. The organization needs to renew the certificate or create a new one to resolve the issue. I'd expect Mozilla to do that soon as the issue is widespread and affecting lots of Firefox users. Users should not remove affected extensions from their installations; the issue will resolve itself once Mozilla fixes it.