strict transport security
I am currently having this issue and i am unable to resolve it
The owner of apps.facebook.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.
This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox only connect to it securely. As a result, it is not possible to add an exception for this certificate.
Learn more…
Report errors like this to help Mozilla identify misconfigured sites
apps.facebook.com uses an invalid security certificate.
The certificate is not trusted because it is self-signed. The certificate is only valid for Daniel The certificate expired on Wednesday, September 06, 2006 7:31 PM. The current time is Friday, July 15, 2016 1:15 PM.
Error code: SEC_ERROR_UNKNOWN_ISSUER
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candylove21 said
The certificate is only valid for Daniel
The certificate expired on Wednesday, September 06, 2006 7:31 PM. The current time is Friday, July 15, 2016 1:15 PM.
Error code: SEC_ERROR_UNKNOWN_ISSUER
Hmm, who is Daniel?
Do you get certificate errors on any other mainstream websites, or only on this particular Facebook app? You should never need to make an exception for a well-run site.
We do have a support article related to that error code. In case you didn't see it before: Troubleshoot security error codes on secure websites.
Does anything there help? If not, we can try some additional troubleshooting.