Firefox Addons disabled due to expired certificate, here’s a fix

Firefox disabled all add-ons because a certificate expired. Here's a temporary fix.

May 5, 2019 by Jessie Mendoza

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Just recently, users started experiencing a weird problem on Firefox which prevented their existing and new addons from running or being installed in the browser.

On May 3, 2019, the Firefox team rolled out a fix for all Firefox Desktop users on Release, Beta and Nightly. The said fix won’t need additional steps to be taken to make the disabled Firefox addons work again.

The Firefox team warns not to remove or even re-install the disabled addons. That won’t force them to work again, instead, it will remove all data associated with the addons.

Note: The fix that’s being introduced by Firefox does not apply to Firefox ESR or Firefox for Android. At the time of this writing, Firefox is still working on a fix for those two.

The fix is using “Studies” system which is enabled by default. If you didn’t turn it off, you don’t need to do anything. But in case you did, you should enable it again by following the steps below.

> Firefox “Preferences”
> Privacy & Security
> {tick} Allow Firefox to send technical and interaction data to Mozilla
> {tick} Allow Firefox to install and run studies

firefox addons disabled expired certificate allow firefox to install and run studies about prefs

According to Firefox, it may take up to six hours for the Study to be applied to your browser. So, be patient.

You can check the status of the Study by typing about:studies in the address bar. Once the fix is active, you should see hotfix-update-xpi-signing-intermediate-bug-1548973 under “Active studies”.

If the Study is completed, you’ll see hotfix-update-xpi-signing-intermediate-bug-1548973 under “Completed studies”.

firefox addons disabled active studies study system hotfix update xpi signing intermediate bug 1548973 active fix bug

Firefox team also added that you may see hotfix-reset-xpi-verification-timestamp-1548973 listed under “Active studies” or “Completed studies”. That is part of the fix, Firefox said.

Note that after your addons have been re-enabled, you can disable “Studies” if you want.

Firefox is still working on a general fix for this addons disabled issue that doesn’t need the use of the Studies system.

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