Firefox users may have noticed that some of their add-ons/extensions have suddenly stopped working today.
Under the extensions tab Firefox displays “could not be verified for use in Firefox and has been disabled”. According to Mozilla’s bug tracker, this is actually a bug and is explained as “all add-ons are disabled due to the expiration of intermediate signing certificate”.
This issue occurred at 5 AM (local time) or 12 AM GMT/UTC, all thanks to the above mentioned bug.
The affected extensions include LastPass, Ghostery, Download Manager (S3), Dark Mode, Honey, uBlock Origin, Greasemonkey, NoScript, and others. The affected extensions have completely stopped working and cannot be re-downloaded from the store.
Temporary Fix
Currently, the only solution to this issue is to either find a replacement or just remove the affected extensions. However, if you use the Firefox developer or Nightly Build, there is a temporary solution. Look under about:config and set the “xpinstall.signatures.required” value to false. Some users have reported that this fix resolves the issue temporarily.
If you’re on a different version of Firefox, you’ll have to enable add-on debugging and will have to manually load each extension’s .xpi file each time you start the browser.
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