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[FIX] Armageddon in Firefox: Most add-ons disabled!

Update: It appears Firefox 66.0.4 has resolved the issue. Chances are you have never experienced this problem.

On 4 May 2019, one of the Mozilla digital certificates used to sign Firefox add-ons expired. With this certificate no longer able to verify the authenticity of the add-ons, user across the faced the loss of access to their Firefox add-ons.

If you are blind and can't see this image, don't worry; you are not missing much.
All (or most) of your add-ons have ceased to function. Notice the new “Unsupported” tab.

This post teaches you how to recover from this failure in about 15 minutes and resume your daily routine work as if this has never happened.

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