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a new tab will not open when i select the division symbol

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when i select the division symbol at the end of my tabs a new tab no longer opens... it has done previously... how do i get this functionality restored?

when i select the division symbol at the end of my tabs a new tab no longer opens... it has done previously... how do i get this functionality restored?

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Caused by the Ask Toolbar extension in Firefox 3.6.13, disable that extension or un-install it.