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 pins the sudden failure on 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 help. Getting extensions back for everyone is going to require Mozilla to issue a patch. Story developing…