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Hw do I turn on the "Price Check/Comparrison" feature?

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The Price Check/Price Comparison fearure only works on one of my computers. How do O turn it on on the other computer. Windows 7, Firefox 25.0.1, Cable modem.

The Price Check/Price Comparison fearure only works on one of my computers. How do O turn it on on the other computer. Windows 7, Firefox 25.0.1, Cable modem.

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That's not a standard Firefox feature. You probably have an extension installed in one PC and not the other.