Missing filebrowser js

gadget/filebrowser.js

+/*global document, jQuery */
+"use strict";
+(function (document, $) {
+  $(document).ready(function () {
+
+    $.ajax({
+      method: 'GET',
+      // XXX Hardcoded
+      url: "browser://browser/ls/",
+      context: $('body'),
+      error: function (jqXHR, textStatus, errorThrown) {
+        $(this).text(errorThrown);
+      },
+      success: function (value, textStatus, jqXHR) {
+        $(this).text(value);
+      },
+    });
+  });
+
+}(document, jQuery));