Firefox sayst billing.microsoft.com uses an invalid security certificate
I'm trying to close out my hotmail account, but when I try to access billing.microsoft.com, Firefox says that page is using an invalid security certificate because the issuer certificate is unknown, and warns me not to proceed by creating an exception
Re: Firefox sayst billing.microsoft.com uses an invalid security certificate
This is a root certificate which serves as a website certificate at the same time. This is an oddity, since in all other cases (that I know), you have a root certificate which signs a website certificate.