With Mozilla Firefox

If your browser is Mozilla Firefox:

1. Click Open Application Menu > Settings > Privacy & Security.
2. Click View Certificates.

   This opens the Certificate Manager dialog box.

3. 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 best known ones, is installed when Firefox is installed.
4. Double-click any of the certificates to display the certificate's details. In many cases the issuer and who the certificate was issued by are the same, indicating a self-signed certificate - one issued by a root CA to itself.