Have you tried another browser?
I just noticed today that I was getting these strange windows opened. At first, it was displaying my google searches in the URL bar, like it woulds say "Star-wars-tor-beta-dates-how-to-" etc. etc. And then it was giving me windows with two tabs each, the url bar was filled with random characters each.
http://i42.tinypic.com/11ak4r8/5

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