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I updated Firefox to 4.0 and now I keep getting a box that says its a JavaScript Application and inside the box it says "Uninstal Set". What do i do???

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I keep getting more and more of them at a time and its annoying me! Everytime I try to open a page in firefox or do anything this happens.

I keep getting more and more of them at a time and its annoying me! Everytime I try to open a page in firefox or do anything this happens.

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Someone else posted this issue recently. Do the suggestions in this thread help?

when open firefox or change website, there is a warning window, [JavaScript Application, "uninstal set" | Firefox Support Forum | Firefox Help]