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FireGestures is a Firefox extension which enables you to execute various commands with six types of gestures:

• Mouse Gestures (Moving mouse with holding right-button)
• Wheel Gestures (Scrolling wheel with holding right-button)
• Rocker Gestures (Left-click with holding right-button and vice versa)
• Keypress Gestures (Mouse gesture with holding Ctrl / Shift key)
• Tab Wheel Gestures (Scrolling wheel on the tab bar)
• Swipe Gestures (3 or 4 fingers multi-touch on Mac's trackpad)