Script "Neuer Tab bei Klick in der Chronik auf einen Link" geht nicht?!

// Neuer Tab bei Klick in der Chronik auf einen Link
// Author @aborix

(function() {

  if (location != AppConstants.BROWSER_CHROME_URL)
    return;

  PlacesUIUtils.openNodeWithEvent = function PUIU_openNodeWithEvent(aNode, aEvent) {
    let window = aEvent.target.ownerGlobal;
    let browserWindow = (window && window.document.documentElement.getAttribute('windowtype') == 'navigator:browser') ? window : BrowserWindowTracker.getTopWindow();
    let where = window.whereToOpenLink(aEvent, false, true);
    if (this.loadBookmarksInTabs) {
      if (where == 'current' && !aNode.uri.startsWith('javascript:')) {
        where = 'tab';
      }
      if (where == 'tab' && browserWindow.gBrowser.selectedTab.isEmpty) {
        where = 'current';
      }
    }
    this._openNodeIn(aNode, where, window);
  }

  let onPopupshowing = function () {
    let historyMenu = document.getElementById('history-menu');
    if (!historyMenu._placesView) {
      new HistoryMenu(event);
      historyMenu._placesView._onCommand = function HM__onCommand(aEvent) {
        let placesNode = aEvent.target._placesNode;
        if (placesNode) {
          PlacesUIUtils.openNodeWithEvent(placesNode, aEvent);
        };
      };
    };
  };

  let historyPopup = document.getElementById('goPopup');
  historyPopup.setAttribute('onpopupshowing', '(' + onPopupshowing.toString() + ')()');

})();