If you can't inspect the certificate via "I Understand the Risks" then try this: Open the "Add Security Exception" window by pasting or typing this URI in the Firefox location/address bar and check the certificate: *chrome://pippki/content/exceptionDialog.xul In the location field of this window type/paste the URL of the website. *retrieve the certificate via the "Get certificate" button *click the "View..." button to inspect the certificate in the Certificate Viewer You can inspect details like the <u>issuer</u> and the certificate chain in the Details tab of the Certificate Viewer. Check who is the issuer of the certificate.