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Tabs not opening when I press the "+" to the top right of tab bar

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When I try to press the open new tab button ( the + sign to the top right) a new tab does not open. Please help!

When I try to press the open new tab button ( the + sign to the top right) a new tab does not open. Please help!

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Probably caused by the Ask Toolbar extension in Firefox 3.6.x versions, disable that extension or un-install it.