when I move across my tabs and touch one to change focus to it, it opens in a new window. The tab goes from my list of tabs and is there as an opened womdow

by touching a tab with the mouse pointer it moved from the tab into a new firefox window.The existing tab has gone.So I need to reload it in the original firefox alongside my other tabs. To the best of my knowledge I have not downloaded any new addon. Using firefox 19

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