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javascript uninstall set box pops up non stop after installing firefox 4.0

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i had mozilla 3.6. Just recently my hotmail stopped working with firefox 3.6 so i upgraded to 4.0. Hotmail now works but i have an error box that says Java script at the top and inside the box it says uninstall set with an ok button. It starts poping up so many times that i can barely close it and get my mouse over to the close page button before it pops up again. i tried unistalling and reinstalling both mozilla 4 and java but nothing works. i really hate internet explorer but until i can resolve this i am stuck

i had mozilla 3.6. Just recently my hotmail stopped working with firefox 3.6 so i upgraded to 4.0. Hotmail now works but i have an error box that says Java script at the top and inside the box it says uninstall set with an ok button. It starts poping up so many times that i can barely close it and get my mouse over to the close page button before it pops up again. i tried unistalling and reinstalling both mozilla 4 and java but nothing works. i really hate internet explorer but until i can resolve this i am stuck

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This issue can be caused by an extension that isn't working properly.

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).