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A glitch is breaking all Firefox extensions
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.
Also a discussion here - https://www.wilderssecurity.com/threads/firefox-addons.396377/page-11#post-2825005