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When I try to open Firefox 5 internet browser it says that it unable to connect even though I have internet connection. Why will Firefox no longer work?

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--I am using Firefox 5 --When I open Firefox it says unable to connect and has been doing this for at least a month. --I have terrific wi-fi connection, but Firefox still doesn't work --I use Windows 7 --Internet Explorer 8 and Google Chrome is connecting to the internet but Firefox 5 does not

--I am using Firefox 5 --When I open Firefox it says unable to connect and has been doing this for at least a month. --I have terrific wi-fi connection, but Firefox still doesn't work --I use Windows 7 --Internet Explorer 8 and Google Chrome is connecting to the internet but Firefox 5 does not

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Depends on your Firewall, see