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Why can I not open a new tab?

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I have three tabs open. There is the "+" tab to open a new one. When I click on this "+" tab or I select FILE->NEW TAB....then a new tab will not open. I am currently limited to three tabs.

I have three tabs open. There is the "+" tab to open a new one. When I click on this "+" tab or I select FILE->NEW TAB....then a new tab will not open. I am currently limited to three tabs.

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The Ask Toolbar is causing that in the Firefox 3.6.13 version. Evidently something in that extension isn't compatible with a Firefox security fix. Disable that extension or un-install it.