Did you just open Firefox only to find all of your extensions disabled and/or otherwise not working?

You’re not alone, and it’s nothing you did.

Reports are pouring in of a glitch that has spontaneously disabled effectively all Firefox extensions.

Each extension is now being listed as a “legacy” extension, alongside a warning that it “could not be verified for use in Firefox and has been disabled”.

A ticket submitted to Mozilla’s Bugzilla bug tracker first hit at around 5:40 PM Pacific, and suggests the sudden failure is due to a code signing certificate built into the browser that expired just after 5 PM (or midnight on May 4th in UTC time).

Because the glitch stems from an underlying certificate, re-installing extensions won’t work — if you try, you’ll likely just be met with a different error message. Getting extensions back for everyone is going to require Mozilla to issue a patch.

In a post on the company’s forum, Mozilla Add-ons Community Manager Caitlin Neiman writes:

At about 6:10 PST we received a report that a certificate issue for Firefox is causing add-ons to stop working and add-on installs to fail.

Our team is actively working on a fix. We will update as soon as we have more information.

Meanwhile, on Twitter: