Firefox cannot connect to internet yet other programs can!

Whenever I load Firefox 3.6.7 It doesn't connect to the internet. It constantly says "Unable to connect" however, other browsers such as Opera, I.E, Chrome, these work, also same for Firefox 4.0 Beta 1 too.
What is the problem?
== This happened ==
Every time Firefox opened
== Few hours ago ==
== User Agent ==
Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.99 Safari/533.4

Just so we're clear, when you say "I've tried all the tips" are you referring to the [[Firefox cannot load websites but other programs can]] article?

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