Logging into the internet using Firefox

I just installed CIS and so far I think it’s the greatest, however, after installing CIS I can’t connect to the internet if I use Firefox. I don’t have a problem if I use SeaMonkey but Firefox just won’t connect.
There’s no error message and no other communication for that matter. When I click on the Firefox shortcut nothing happens.
Any help would be appreciated.

P.S. When I first installed CIS I didn’t have any problems. I was able to connect using Firefox. But now, for some reason Firefox just won’t connect, which leads me to think that I did something in the configuration that disabled the Firefox Browser.

Thank you in advance for your help (:WAV)

Have you set Firefox as a web browser in your Firewall>Advanced>Network Security Policy?. Also do this with any other browsers you use.