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Usually same window. More people are learning CTRL+left click or middle-click these days if they want something in a new tab/window and get annoyed at another tab being opened with a normal click (I get slightly annoyed by it). And there probably are still people out there who get completely confused by new windows. That number is likely greater than those affected by the lack of the back button (which processor does this?). I guess you could test it though.
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