layoutdebug-prefs.js
/* 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/. */
pref("toolkit.defaultChromeURI", "chrome://layoutdebug/content/layoutdebug.xul");