if(location == "chrome://browser/content/browser.xul"){
   gBrowser.addEventListener("mousedown", function(event){
      if(event.button != 2) return;
      this.downX = event.screenX;
      this.downY = event.screenY;
      document.getElementById("contentAreaContextMenu").hidden = true;
   }, false);
   gBrowser.addEventListener("mouseup", function(event){
      if(event.button != 2) return;
      if(this.downX == event.screenX && this.downY == event.screenY) {
         document.getElementById("contentAreaContextMenu").hidden = false;
         window.removeEventListener("mousemove", sbawMoveScrollBar, true);
      }
   }, false);

   var functions = ["sbawDownHandler", "sbawUpHandler", "sbawUpHandler"];
   var strings = ["e.preventDefault();", "e.stopPropagation();"];
   for(var i=0; i<functions.length; i++)
      for(var j=0; j<strings.length; j++)
         try { eval(functions[i] + "="
            + eval(functions[i]).toString().replace(strings[j], "")); }catch(e){}

   try { eval("sbawShowContextMenu" + "="
      + eval("sbawShowContextMenu").toString()
         .replace("sbawEnableContextMenu = true;", "sbawEnableContextMenu = true; return;"));
   }catch(e){}
}