Mouse Gestures Add-in for Internet Explorer provides Opera like Mouse Gestures to Internet Explorer. (Thanks Eric)
"Most of the gestures are triggered by dragging the mouse with right button down. For example, to open a new window, hold the right mouse button, move the mouse down then let go. Easy!If you decide you want to cancel a gesture, either: drag the mouse in a few random directions before letting go of the mouse or hold the mouse still for a few seconds".
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