Mozilla Firefox has stopped working on my computer, but internet Explorer still does?

I've used Mozilla in the past, but it suddenly stopped working, I've tried the old and new versions and every time i try to use it, it just says "unable to connect" and wont let me go onto the internet. the actual program fully functions on my computer, i just cant surf the web with it, does anyone know why this could be?
Hmm, check if offline mode is enabled. If it is, disable it.

Check your proxy settings; if you require one to get to the net make sure it is typed in correctly.

Make sure your computer's Firewall allows Firefox. Add it to the exceptions list or w/e your Firewall calls it.

Otherwise that's kind of odd why it will not connect.
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