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Firefox on my laptop will not allow me to open multiple tabs, how can I fix this issue?

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I usually use firefox and yesterday was downloading a photoshop program called gimp. all of a sudden after downloading it, firefox stops allowing me to open multiple tabs. I click on file and new tab, but it still will not work.

I usually use firefox and yesterday was downloading a photoshop program called gimp. all of a sudden after downloading it, firefox stops allowing me to open multiple tabs. I click on file and new tab, but it still will not work.

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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: