aboutExtraStylesheet.js

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/* 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/. */

(async function () {

  // Add the variables stylesheet.

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

  contentStylesheet.rel = "stylesheet";

  contentStylesheet.href = "chrome://messenger/skin/variables.css";

  document.head.appendChild(contentStylesheet);

})();