<!-- 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/. --> <html> <head> <meta charset="UTF-8"> <title>Add-on Page</title> </head> <body> <p>This is an add-on page test!</p> <script> function getTestURL() { return window.document.documentURI + ""; } </script> </body> </html>