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I can't open multiple tabs

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I can only have open one tab, mozilla won't let me open another tab. I don't know how to fix this problem. I can only work with one tab at a time. Basically mozilla won't let me use multiple tabs while browsing.

I can only have open one tab, mozilla won't let me open another tab. I don't know how to fix this problem. I can only work with one tab at a time. Basically mozilla won't let me use multiple tabs while browsing.

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The Ask Toolbar is causing that in the Firefox 3.6.13+ versions. Uninstall that extension.

There are a couple of places to check for the Ask toolbar: