netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
var wu = window.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
.getInterface(Components.interfaces.nsIDOMWindowUtils);
var i = Math.floor(Math.random()*20);
wu.sendMouseEvent('mousedown', 20*i, 20*i, 0, 3, 0);
wu.sendMouseEvent('mouseup', 20*i, 20*i, 0, 1, 0);
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