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.js/app.js

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+// DOMContentLoaded is fired once the document has been loaded and parsed,
+// but without waiting for other external resources to load (css/images/etc)
+// That makes the app more responsive and perceived as faster.
+// https://developer.mozilla.org/Web/Reference/Events/DOMContentLoaded
+window.addEventListener('DOMContentLoaded', function () {
+  // We'll ask the browser to use strict code to help us catch errors earlier.
+  // https://developer.mozilla.org/Web/JavaScript/Reference/Functions_and_function_scope/Strict_mode
+  'use strict';
+  var translate = navigator.mozL10n.get;
+  // We want to wait until the localisations library has loaded all the strings.
+  // So we'll tell it to let us know once it's ready.
+  navigator.mozL10n.once(start);
+  // ---
+  function start() {
+    var message = document.getElementById('message');
+    // We're using textContent because inserting content from external sources into your page using innerHTML can be dangerous.
+    // https://developer.mozilla.org/Web/API/Element.innerHTML#Security_considerations
+    message.textContent = translate('message');
+  }
+});