context: function locateHelpWindow(helpFileURI) {  var windowManager = Components.classes['@mozilla.org/appshell/window-mediator;1'].getService();  var windowManagerInterface = windowManager.QueryInterface( Components.interfaces.nsIWindowMediator);  var iterator = windowManagerInterface.getEnumerator( "mozilla:help");  var topWindow = null;  while (iterator.hasMoreElements()) {    var aWindow = iterator.getNext();    if (aWindow.getHelpFileURI() == helpFileURI) {      topWindow = aWindow;      break;      }    }  return topWindow;}
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