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Why did one of my computers update to Firefox Yahoo! Edition and what's the difference?

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Both computers updated same day and the laptop updated with the Yahoo! edition, but the desktop did not. Was wondering why, and what is the difference? Laptop runs Windows 7 and desktop runs Windows 8

Both computers updated same day and the laptop updated with the Yahoo! edition, but the desktop did not. Was wondering why, and what is the difference? Laptop runs Windows 7 and desktop runs Windows 8

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It may happened because of Yahoo Toolbar.

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