If your browser is Mozilla Firefox:
- Click Tools > Options > Advanced. Then, depending on your version, either scroll down and click Manage Certificates, or click the Security tab and then View Certificates.
- Click the Authorities tab. This lists the CAs known and trusted by your Web browser - that is, whose certificates have been installed in the SSL software in your Web browser. A default set of these, consisting of many of the world's best known ones, is installed when Firefox is installed.
- Double-click any one of the certificates shown. This displays the certificate on the screen. In many cases the "Issued To" and "Issued by" names are the same, indicating a self-signed certificate - one issued by a root CA to itself.
- Click the Certification Path tab. This lists the chain of CAs from the certificate back to the root CA. If this certificate is for a root CA, there is just one entry.
- Click OK to close the certificate.
- Look at some other certificates in the same way. You may find that all the certificates are for root CAs. If you find one for a subordinate CA, you can see the chain of CAs, from the subordinate CA that issued this certificate, back up through the hierarchy to the root CA.
- Close the dialog boxes.
