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Here's what i find out about how blekko manage to take over your chrome browser. It sets your chrome browser to "open a specific page or set of pages" "on startup" from the "setting" options(the wrench button on the top right) instead of "open the new tab page" "on startup" from your browser. So, if you can uncheck that option and check back your "open the new tab page" on startup. You should be all set from there.