Mozilla explains why Firefox add-ons have stopped working … and how to fix the problem



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Since late last night, Firefox users had a problem that prevented the use of add-ons. Extensions have been disabled and users have been unable to reactivate them, causing confusion and frustration around the world.

It turns out that the reason Firefox add-ons have stopped working is that a signing certificate has expired. After determining the cause of the problem, Mozilla has developed a patch for users of the desktop version of Firefox on the Release, Beta and Nightly channels.

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The reason for this problem was revealed in a Bugzilla thread, although Mozilla did not publicly announce the cause of the add-on failure. However, in an article on the Mozilla add-ons blog, Kevin Needham, Mozilla product manager, said:

Late Friday, May 3rd, we learned of a problem with Firefox that prevented the execution or installation of new add-ons. We are sorry for the inconvenience caused to Firefox users.

Our team has identified and deployed a patch for all Firefox Desktop users on Release, Beta, and Nightly. The fix will automatically be applied in the background in the next few hours.

It is very likely that you will have nothing to do to receive this fix because Mozilla is using the unusual step of using the System Studies, usually used to test new ones. features, to deploy it. Unless, of course, you have studies for the disabled. You can check if you have activated it by heading to The options > Privacy and in search of Allow Firefox to install and run studies option. Simply check the box if it is not already done.

Mozilla is also working on a patch that does not involve the use of the Studies system.

Needham also says:

The patch application may take a few hours, but to check if this is the case, you can click "View Firefox Studies" to see if the hotfix added with "1548973" is present.

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