Mozilla Add-ons
twitter.com/mozamo

We're investigating an issue with a certificate which may cause your firefox extensions to stop work working or fail to install.
Our team is actively working to fix the issue and we’ll post more information shortly.

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It's been about two hours since we became aware of the certificate issue.
No new updates at this time other than the team is still working on a fix.
https://twitter.com/5chan_nel (5ch newer account)