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I cannot open a new tab by clicking onto the + to the right of all open tabs. I was able to do this until today. I have closed and re-opened my browser.....even restarted my computer. Help!

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I cannot open a new tab by clicking onto the + to the right of all open tabs. I was able to do this until today. I have closed and re-opened my browser.....even restarted my computer. Help!

I cannot open a new tab by clicking onto the + to the right of all open tabs. I was able to do this until today. I have closed and re-opened my browser.....even restarted my computer. Help!

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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: