Whenever I click new tab, following webpage appears, I didn't get the option of disabling the new tab setting to default. Help me?

I recently installed Firefox 17.0.1, Whenever I click (+) or (New Tab), following web page ( loads automatically. I tried to disable it by configuring to about:newtabs, but couldn't get resolved. Further, there is no any user interface for setting default newtab as blank, or any other favorite page. Please help if there is bug or something, and help me solve.

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