On Friday, the expiration of a Mozilla certificate used to check the signatures of add-on codes in Firefox desktop and Android Web browsers caused a nearly universal failure of Firefox plug-ins and extensions as browsers detected them as invalid and disabled them.
The bug, dubbed “armagadd-on 2.0,” was addressed by a hot-fix issued over the weekend, and a new version of the browser has been pushed out to some users. But users of the Android and Extended Support Release do not yet have a fix, and the workaround may not help them.
This isn’t the first time this sort of thing has happened with Firefox. The original “armagadd-on” happened almost exactly three years ago, on May 2, 2016, when an expired certificate caused signature verification errors for add-ons.
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