Very useful addon. Would get 6 stars if it would offer to assign separate functions depending where the gesture starts.

Example:

* Rightclick-Down on a link -> Open in new tab
* Rightclick-Down on a free area -> Close current tab
* Rightclick-Down on a bitmap -> Download to customizable destination

Also, please consider allowing to combine gestures with modifier keys (SHIFT/ALT/WIN/CTRL) and left/right mouse button on a case by case basis.