Mouse gestures (open a new tab, for example) on the speed dial open the context menu
Is this a known bug / option to turn it off somewhere?
Interestingly enough, the mouse gestures work as intended, but it always opens the context menu (except for when you close the speed dial via mouse gesture). As this doesn't happen on any other tab I guess this is a bug.
File a bug report as it's a pretty obvious bug. The context menu appears on the mouse up event.