Comment 3 for bug 721102

good start. :) but this will need an additional verification to make sure that the tab that received the "mouse down" event is the same as the one on "mouse up". eg i start middle-clicking on tab1, then drag the mouse to tab2; no tab should be closed in that case.

what about shift + left-click? should that also be changed to take effect only after the mouse has been released?