Anzahl Unterordner und Lesezeichen im Ordner Anzeigen nach unten

(function() {

  if (!window.gBrowser)
    return;

  function setFunction() {
    PlacesViewBase.prototype._mayAddCommandsItems =
    function PVB__mayAddCommandsItems(aPopup) {
      let hasMultipleURIs = false;
      let menuitemCount = 0;
      let menuCount = 0;
      if (aPopup._placesNode.childCount > 0) {
        for (let item of aPopup.children) {
          if (item._placesNode) {
            if (item.localName == 'menuitem') {
              menuitemCount++;
            } else if (item.localName == 'menu') {
              menuCount++;
            }
          }
        }
        if (menuitemCount > 0 || menuCount > 0) {
          hasMultipleURIs = true;
        }
      }
      if (!hasMultipleURIs)  {
        aPopup.setAttribute("nofooterpopup", "true");
        if (aPopup._endOptOpenAllInTabs) {
          aPopup.removeChild(aPopup._endOptOpenAllInTabs);
          aPopup._endOptOpenAllInTabs = null;
          aPopup.removeChild(aPopup._endOptSeparator);
          aPopup._endOptSeparator = null;
        }
        return;

      }      
              
          var css =`
      .openintabs-menuitem {
        background: #cacaca !important;
        color: #000000 !important;
        font-weight: bold !important;
      }
      .openintabs-menuitem {
        -moz-box-ordinal-group: 5 !important;
      }

      `;
  
  var sss = Cc['@mozilla.org/content/style-sheet-service;1'].getService(Ci.nsIStyleSheetService);
  var uri = makeURI('data:text/css;charset=UTF=8,' + encodeURIComponent(css));
  sss.loadAndRegisterSheet(uri, sss.AUTHOR_SHEET);

      aPopup.removeAttribute("nofooterpopup");
      if (!aPopup._endOptOpenAllInTabs) {
        aPopup._endOptSeparator = document.createXULElement("menuseparator");
        aPopup._endOptSeparator.className = "bookmarks-actions-menuseparator";
        aPopup.insertBefore(aPopup._endOptSeparator, aPopup.firstChild);
        aPopup._endOptOpenAllInTabs = document.createXULElement("menuitem");
        aPopup._endOptOpenAllInTabs.className = "openintabs-menuitem";
        if (this.options?.extraClasses?.entry) {
          aPopup._endOptOpenAllInTabs.classList.add(
            this.options.extraClasses.entry
          );
        }
        aPopup._endOptOpenAllInTabs.setAttribute(
          "oncommand",
          "PlacesUIUtils.openMultipleLinksInTabs(this.parentNode._placesNode, event, " +
            "PlacesUIUtils.getViewForNode(this));"
        );
        aPopup._endOptOpenAllInTabs.setAttribute(
          "onclick",
          "checkForMiddleClick(this, event); event.stopPropagation();"
        );
        aPopup.insertBefore(aPopup._endOptOpenAllInTabs, aPopup.firstChild);
      }
   
   let label = menuitemCount + " Link"; 
        if (menuitemCount != 1) {
          label += "s";
       }
        label += " / " + menuCount + " Ordner."
        if (menuitemCount == 1) {
          label += " -> Link in Tab öffnen."
        } else if (menuitemCount > 1) {
          label += " -> Links in Tabs öffnen."
        }

      aPopup._endOptOpenAllInTabs.setAttribute("label", label);
    }
  }

  setTimeout(function() {
      setFunction();
  },50);
  
})();