Receiving your connection is not secure error "Your connection is not secure The owner of mail.google.com has configured their website improperly. To protect y

Receiving the following error when trying to connect to most web sites. Your connection is not secure The owner of mail.google.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.