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When I attempt to open a new tab by clicking the "new tab" button on the tabs bar, the tab will not open. Can this be fixed and how?

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When I open my Firefox browser, the normal 1 tab comes up. But when I attempt to open new tabs with the "new tabs" button, a new tab will not open. I have also tried right-clicking on the tabs toolbar but tabs will not open. The only way I can get a new tab to open is by right-clicking on a link and selecting the "open new tab" option in the right-click menu.

When I open my Firefox browser, the normal 1 tab comes up. But when I attempt to open new tabs with the "new tabs" button, a new tab will not open. I have also tried right-clicking on the tabs toolbar but tabs will not open. The only way I can get a new tab to open is by right-clicking on a link and selecting the "open new tab" option in the right-click menu.

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The Ask Toolbar is causing that in the Firefox 3.6.13 version. Disable that extension or un-install it.

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I do not have the Ask toolbar and it is not installed in any of my browsers to my knowledge.