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An expired certificate on the Mozilla Add-ons infrastructure is disabling Firefox add-ons for millions of users, and is also preventing users from re-activating or (re-)installing extensions.

The issue doesn't impact all Firefox users, but it impacted enough to trigger a massive surge of complaints on Twitter, Reddit, and other social media sites.

At the time of writing, the issue is still impacting Firefox users. The browser maker has formally acknowledged the issue in an email to ZDNet, on Twitter, in a status page, and in a bug report.

"We're sorry that there is currently an issue where existing and new add-ons are failing to run or be installed on Firefox," a Mozilla spokesperson said. "We know what the issue is and are working hard to restore add-on functionality to Firefox as soon as possible."

"We'll continue to provide updates via our Twitter channels. Please bear with us while we get the problem fixed," the browser maker said.

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Many Firefox users around the world are browsing without their usual set of extensions after they suddenly stopped working earlier this evening. The event occurred as the clock rolled over on UTC (Coordinated Universal Time, aka GMT or Greenwich Mean Time), and impacted users quickly narrowed it down to "expiration of intermediate signing cert" -- as it's described on Mozilla's bug tracker.

This same problem almost happened three years ago, but "armagadd-on" 2.0 has torn things up once again. In a statement provided to Engadget, Product Lead Kev Needham said:

We're sorry that there is currently an issue where existing and new add-ons are failing to run or be installed on Firefox. We know what the issue is and are working hard to restore add-on functionality to Firefox as soon as possible. We'll continue to provide updates via our Twitter channels. Please bear with us while we get the problem fixed.