Mozilla began distributing new Firefox updates on Sunday to resolve a problem that broke the extensions for many browser users on Friday. On the night of Friday to Saturday, May 4, at 12:00, the digital certificate that Mozilla used to sign Firefox add-ons (also known as extensions) expired. Mozilla used this certificate to verify that the extensions installed in the user’s browsers were the same as those hosted on the official Mozilla add-ons portal. Once the certificate expires, Firefox browsers can not validate the locally installed extensions and disable all add-ons in user browsers immediately.In addition, users could not re-enable the extensions or install new ones for the same reason because the signing certificate had expired, leaving most of the more than 100 million Mozilla users without a form. Simple to reactivate extensions.