I get the error 'SEC_ERROR_UNKNOWN_ISSUER' on protected pages (Gmail, Twitter, Wikipedia, etc.)

I started getting the SEC_ERROR_UNKNOWN_ISSUER on Gmail, Twitter, Wikipedia and other https sites. In addition, LinkedIn and Reddit displayed incorrectly - no images, stripped like old html Web sites. There is no similar problem with IE or Chrome. I went through the troubleshooting pages and do not use any anti-virus, my system clock is fine, I deleted the file cert8.db and uninstall-reinstall did not help either.

Yes, it was a matter of backend on my network. Installation of an additional certificate corrected the problem. Apparently other browsers install the necessary certificate automatically, but must be installed manually on Firefox sometimes.

Tags: Firefox

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