Fix Firefox Add-ons Issue

Saturday, May 4, 2019 @ 4:42 pm

Firefox ran into an issue where it would disable all installed add-ons. This post contains information on how to resolve this and get your add-ons back.

The issue – Firefox claims add-ons cannot “be verified for use in Firefox” and disables them (moving them under an “Unsupported” tab in the add-ons manager:

The official blog post by Firefox on this issue can be found here – – although their solution involves enabling the “Studies” system which I’m not too fond of.

Fortunately there is a way to grab the fix that they distribute via the “Studies” system so you can resolve this issue without enabling the “Studies” system. This fix also works for Firefox on mobile:

  1. Open a new tab, copy and paste into your address bar and press Enter
    1. If you see “Firefox has prevented this site from asking you to install software on your computer”, click on “OK!” then click in the address bar and press Enter again
  2. Click on “Add” when you see the following:
  3. All done! Your add-ons should shortly be re-enabled. If not, exit Firefox and start it again.

If you like your Firefox installation clean and wish to remove the hotfix extension once it has done its job, you can safely do so as the changes it makes are permanent and the extension itself is not needed anymore.

  1. Copy and paste about:support into your address bar and press Enter
  2. Click on the “Open Directory” button
  3. Double-click on the “extensions” folder
  4. Find and delete “[email protected]“: