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I upgraded my Yahoo IM and after it uploaded, my homepage went from Firefox to the Yahoo homepage and I cannot get the firefox homepage to come up. How can I get the Yahoo homepage off and get the firefox homepage on?

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I upgraded my Yahoo IM and after it uploaded, my homepage went from Firefox to the Yahoo homepage and I cannot get the Firefox homepage to come up. I have tried to reinstall Firefox, but the Yahoo homepage still comes up. How can I get the yahoo page off and get the Firefox page back on?

I upgraded my Yahoo IM and after it uploaded, my homepage went from Firefox to the Yahoo homepage and I cannot get the Firefox homepage to come up. I have tried to reinstall Firefox, but the Yahoo homepage still comes up. How can I get the yahoo page off and get the Firefox page back on?

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Here are instructions to restore the default home page.