Update security certificate(s)?
Getting a message that Yahoo's security certificate cannot be validated and therefore is being blocked by Firefox Your security certificate is out of date and will not load properly in Firefox. Going to move to another site if you can't fix this soon.
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AdminProduct Support (Admin, Yahoo) commented
Hi,
Hi,Please use this site to diagnose the issues related to certificate installation
https://www.sslshopper.com/ssl-checker.html#hostname=login.yahoo.com
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rbot commented
Firefox full message - Your connection is not secure
The owner of login.yahoo.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 may only connect to it securely. As a result, it is not possible to add an exception for this certificate.
login.yahoo.com uses an invalid security certificate.
The certificate is not trusted because the issuer certificate is unknown. The server might not be sending the appropriate intermediate certificates. An additional root certificate may need to be imported.
Error code: SEC_ERROR_UNKNOWN_ISSUER