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how do I fix a script error that keeps coming up when I switch from one site to another?

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I can not get this script error to go away! How do I fix it? It is slowing down my computer and driving me crazy.

Script: file:///C:/Documents%20and%20Settings/Administrator/Application%20Data/Mozilla/Firefox/Profiles/u4glfkfu.default/extensions/%7B635abd67-4fe9-1b23-4f01-e679fa7484c1%7D/components/nsYahooFileIO.js:26

I can not get this script error to go away! How do I fix it? It is slowing down my computer and driving me crazy. Script: file:///C:/Documents%20and%20Settings/Administrator/Application%20Data/Mozilla/Firefox/Profiles/u4glfkfu.default/extensions/%7B635abd67-4fe9-1b23-4f01-e679fa7484c1%7D/components/nsYahooFileIO.js:26

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{B635abd67-4fe9-1b23-4f01-e679fa7484c1} is an extension that is related to Yahoo. You didn't bother to provide your "Troubleshooting Information" so I can't guess the name of that extension. You need to figure out which extension that is, and disable it.

http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes