Firefox fix restores broken browser extensions -- but not for everyone

Firefox logo on blue background

Firefox logo on blue background

We reported this morning that Mozilla had a major issue in their hands as the company forgot to renew their security certificate that is used to sign Firefox add-ons.

Extensions, also called add-ons, let you customize browsers to do things like block ad tracking or offer video-playback speed controls.

"So sorry for the issue we're having with add-ons right now!"

With the vast library of extensions one of the main reasons for choosing Firefox as a browser, no doubt millions of users are feeling inconvenienced today. And some people aren't getting the update, Mozilla said on Twitter on Saturday. Mozilla is updating Firefox with an unusual mechanism, the studies tool for testing new features, and some people may have disabled that. It doesn't affect all users, though.

Many Firefox users around the world are browsing without their usual set of extensions after they suddenly stopped working earlier this evening.

More details regarding this ongoing issue can be found via this Mozilla bug report.

"In order to be able to provide this fix on short notice, we are using the Studies system". You can check if you have studies enabled by going to Firefox Preferences - Privacy & Security - Allow Firefox to install and run studies. The fix doesn't yet work for Firefox on Android or the slower-moving Extended Support Release (ESR) version of Firefox. But nonetheless, it seems that the general fix would reach the browser shortly as well.