Firefox says that I have a firewall that prevents me from connecting to Internet?

I´ve used Firefox for a while now and I was really happy until now it just won´t work any more. When i try to connect to Internet with firefox I get a message "Connection failed" My firewall is preventing me from connecting according Firefox. But I´ve really done everything from turning my Firewall off and it still doesn´t work. I do not have any antivirus thats preventing Firefox from connecting. Internet Explorer still works perfect though.
Please, could someone help me because i don´t want to use Internet Explorer.
== This happened ==
Every time Firefox opened
== I was updating Firefox ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.5.30729; .NET CLR 3.0.30729; InfoPath.2; OfficeLiveConnector.1.3; OfficeLivePatch.0.0)

In Firefox 3.6.4 and later the default connection settings have been changed to "Use the system proxy settings".
See "Firefox connection settings" in [[Server not found]]
You can find the connection setting here: Tools > Options > Advanced : Network : Connection
If you do not need to use a proxy to connect to internet then select ''No Proxy'
Another possible cause is security software (firewall) that blocks or restricts Firefox without informing you about that, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox.
See [[Server not found]] and [[Firewalls]] and http://kb.mozillazine.org/Firewalls

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Firefox says that I have a firewall that prevents me from connecting to Internet?

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