If you are using Linux or macOS:open
about:config and set
ui.context_menus.after_mouseup to true. Otherwise, the context menu will show up before the extension can detect the gesture.
To make a gesture, hold the right mouse button, move the mouse and release the button.
Gestures:
- Down: open a new tab
- Down → Right: close the tab
- Down → Up: duplicate the tab
- Left: go to previous page
- Right: go to next page
- Up → Down: reload the page
- Up: stop page loading
The extension doesn't work on restricted pages like
addons.mozilla.org 
