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how can I get rid of .NET framework assistant on Firefox 4.0.1?

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Firefox 4.0.1 switches to .NET Framework Assistant when I'm on ebay. I have not intentionally installed it. How can I get rid of it

Firefox 4.0.1 switches to .NET Framework Assistant when I'm on ebay. I have not intentionally installed it. How can I get rid of it

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Addons > Extensions > Disable or Remove if allowed