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I have Firefox 3.6.13 and when i click on the + sign a new tab does not pop up anymore. How do I fix?

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Neither clicking on the + sign for a new tab or trying Control+T will open a new tab. How do I fix?

Neither clicking on the + sign for a new tab or trying Control+T will open a new tab. How do I fix?

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