Is your home page set to google or something else? It is possible that the homepage of yr FF is set to a webpage, which is giving this error at startup.
Try to reinstall FF, as thetechfreak suggested, and try a stable version like, Firefox 3.6.13.
If problem persists. use Chrome
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Marty: Hey, Doc, we better back up. We don't have enough road to get up to 88.
Doc Brown: Roads? Where we're going, we don't need, "roads!" :)
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