The default Firefox comes with certificates from well-known commercial CAs. My ISP is also CA and Firefox cannot verified it because the CA is not recognized. How do I force Firefox to accept my ISPs certificate?
Like many apps Firefox needs to have a certificate from the CA that signed the web server’s certificate. However, you can import a new CA certificate into Firefox version 3.5 using the following simple procedure:
Fire a Firefox browser (i.e. Launch Firefox)
Choose Preferences from the Edit menu.
Click the Advanced button.
Select the Encryption pane.
Click the View Certificates button.
Click the Authorities tab.
Click the Import button at the bottom of the screen.
Navigate to the CA certificate and import it.