Restoring Firefox Extensions After The Firefox 43 Update

Firefox recently updated to version 43 & with that, they automatically disabled all extensions which are not signed, even if they were previously installed by a user and used for years.

If you go to the add ons screen after the update (by typing about:addons in the address bar) you will see a screen like this

Extensions which are submitted to the Mozilla Firefox add ons directory are automatically signed when approved, but other extensions are not by default:

Only Mozilla can sign your add-on so that Firefox will install it by default. Add-ons are signed by submitting them to AMO or using the API and passing either an automated or manual code review. Note that you are not required to list or distribute your add-on through AMO. If you are distributing the add-on on your own, you can choose the Unlisted option and AMO will only serve as the way to get your package signed.

In a couple days we will do that submission to get the add ons signed, but if you recently had the extensions go away it is fairly easy to override this signing feature to get the extensions back working right away.

Step 1: go to the Firefox settings configuration section

Type about:config into the address bar & hit enter. Once that page loads click on the “I’ll be careful, I promise” button.

Step 2: edit the signing configuration

Once the configuration box loads you’ll see a bunch of different listed variables in it & a search box at the top. In that search box, enter
xpinstall.signatures.required

By default xpinstall.signatures.required is set to TRUE to force add ons to be signed. Click on it until it goes to bold, which indicates that the TRUE setting is set to FALSE.

Step 3: restart Firefox

After changing the add on signature settings, restart Firefox to apply the setting & your Firefox extensions will be restored.

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