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Ever since downloading Firefox 4, it won't open http://att.my.yahoo.com/. It freezes and says "Not Responding" at the top of Firefox. Can anyone help me fix this?

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FYI - I previously had the beta version of Firefox 4 installed before installing the official release of FF 4. Yahoo mail did not work in the beta version either.

FYI - I previously had the beta version of Firefox 4 installed before installing the official release of FF 4. Yahoo mail did not work in the beta version either.

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I don't have a problem accessing that site as can be seen from the screenshot.

Do you have any kind of security search software installed like AVG Safe Search, McAfee Site Advisor, or similar, or do you have the Ask Toolbar installed?

Try running Firefox in Diagnose Firefox issues using Troubleshoot Mode. If it functions properly in that configuration, then one of your add-ons is the culprit.