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when I open home page using Firefox v.8.0.1 on a Vista 64 system, I get this in the address bar: C:/Users/Sandy/Documents/undefined. How do I correct this?

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The address bar should read: att.my.yahoo.com....when I open my home page using Firefox...but instead it say's: C:/Users/Sandy/Documents/undefined.

The address bar should read: att.my.yahoo.com....when I open my home page using Firefox...but instead it say's: C:/Users/Sandy/Documents/undefined.

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From the Firefox menu bar, click: Tools -> Options -> General and then select your own home page of choice, or a blank page, if you prefer.