Offenbar funktionieren alle Benutzerskripte nicht mehr im Nightly

// ==UserScript==
// @include       chrome://mozapps/content/downloads/unknownContentType.xhtml
// @charset       UTF-8
// @version       Fx114+

// ==/UserScript==
(function () {
  const Cu = Components.utils;
  if (!window.FileUtils) ChromeUtils.importESModule('resource://gre/modules/FileUtils.sys.mjs');
  if (!window.Services) Cu.import('resource://gre/modules/Services.jsm');

  setTimeout(function () {
    saveTo();
  }, 200);

  function saveTo() {
    // Config
    const dirArray = [
            //[FileUtils.getDir('UChrm', []).path, 'chrome'],
            ['D:\\Download Firefox', 'Download Firefox'],
            ['D:\\Download Firefox\\Dokumente'],
            ['D:\\Download Firefox\\Bilder'],
            ['D:\\Download Firefox\\Software'], 
            ['D:\\Download Firefox\\Ablage'],
            ['D:\\Download Firefox\\Sonstiges'],
            ["C:\\", "C:"],
            ["E:\\", "E:"],
            ];
    const button = document.getElementById('unknownContentType').getButton('cancel');
    const saveTo = button.parentNode.insertBefore(document.createXULElement('button'), button);
    const saveToMenu = saveTo.appendChild(document.createXULElement('menupopup'));

    saveTo.classList.toggle('dialog-button');
    saveTo.label = 'Speichern nach';
    saveTo.type = 'menu';


    const css =`
      hbox.dialog-button-box button.dialog-button menupopup {
        background: gold !important;
        min-width: 220px !important;
        padding: 5px !important;
        margin: 15px 0 0 -62px !important;
        border: 3px solid dodgerblue !important;
    }
        hbox.dialog-button-box button.dialog-button menupopup menuitem{
        appearance: none !important;
        color: blue !important;
        background: #fefefc !important; 
        border: 1px solid silver !important;
        margin-top: 1px !important;
        border-radius: 7px !important;
        padding-left: 12px !important;
    }
        hbox.dialog-button-box button.dialog-button menupopup menuitem:hover {
        background: greenyellow !important;
        border: 1px solid red !important;
    }    
        hbox.dialog-button-box button.dialog-button menupopup menuitem.menuitem-iconic label.menu-iconic-text {
        color: blue !important;    
        font-size: 15px !important;
        font-weight: 600 !important;
        margin-left: 12px !important;
        margin-top: 1px !important;
    } `;

    const sss = Cc['@mozilla.org/content/style-sheet-service;1'].getService(Ci.nsIStyleSheetService);
    const uri = Services.io.newURI('data:text/css,' + encodeURIComponent(css));
    sss.loadAndRegisterSheet(uri, sss.AGENT_SHEET);

    dirArray.forEach(function (directory) {
      const [name, dir] = [directory[1], directory[0]];
      const mi = document.createXULElement('menuitem');
      const item = saveToMenu.appendChild(mi);
      item.setAttribute('label', (name || (dir.match(/[^\\/]+$/) || [dir])[0]));
      item.setAttribute('image', 'moz-icon:file:///' + dir + '\\');
      item.setAttribute('class', 'menuitem-iconic');
      item.addEventListener('command', function () {
        const locationtext = document.getElementById('locationtext');
        const pathFile = dir + '\\' + (locationtext ? locationtext.value : document.getElementById('location').value);
        const file = new FileUtils.File(pathFile);
        dialog.mLauncher.saveDestinationAvailable(file);
        dialog.onCancel = function () {};
        close();
      });
    });
  }
}());