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When closing tabs with middle mouse button too fast - the window maximizes. In this case the middle mouse button fast cklicks acts as double click with LMB. Tabs closes but window maximizes. Very iritating.
+1 It's been an annoyance for me since the beginning and it's still present in the 7.2 nightlies using windows 7 x64
*** This bug has been marked as a duplicate of bug 196992 ***