dialogShadowDom.js

Enable keyboard shortcuts

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/**

 * When the dialog window loads, add a stylesheet to the shadow DOM of the

 * dialog to style the accept and cancel buttons, etc.

*/

window.addEventListener("load", () => {

  const link = document.createElement("link");

  link.setAttribute("rel", "stylesheet");

  link.setAttribute("href", "chrome://messenger/skin/themeableDialog.css");

  document.querySelector("dialog").shadowRoot.appendChild(link);

});