All extensions disabled due to expiration of intermediate signing cert

Looks like all extensions have been disabled for all Firefox users.

I think this fail-closed behavior is more of a security issue than the one it is trying to solve. All of my security add-ons - Privacy Badger, NoScript, Decentraleyes, and many more were disabled. Even worse, it happened without notice to the user.

One moment I was browsing the internet (just barely) secured by these add-ons, and the next moment, all of them disappeared (without warning) and I only noticed when I saw my password manager was missing.

If it failed open, anyone unlucky enough to update their extensions could end up having a malicious version installed. It also would have taken longer to notice.