Rated 4 out of 5 stars

Great Add-on,

but there is an annoying bug with Firefox 5: If the right mouse button
is the gesture key AND if dom.event.contextmenu.enabled is true
(Javascript: disable or replace context menus), then the context menu is
not suppressed. It pops up after every gesture.

This review is for a previous version of the add-on (0.22.1).