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I cannot open a new tab. If I click on Edit --> New Tab or Cntrl T a new tab does not appear.

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I cannot open a new tab. If I click on Edit --> New Tab or Cntrl T a new tab does not appear.

I cannot open a new tab. If I click on Edit --> New Tab or Cntrl T a new tab does not appear.

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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: