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Could open new tab manually

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When I tried to open a tab and click on + sign . Nothing happens and I cannot start a new site in new tab.

Instead I have to start a new window to open new site.

When I tried to open a tab and click on + sign . Nothing happens and I cannot start a new site in new tab. Instead I have to start a new window to open new site.

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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: