<!DOCTYPE> <html> <head> <title>Test Extension Background page</title> <meta charset="utf-8"> </head> <body> <!-- The following two DOM elements ensure that the polyfill doesn't detect the globals defined for these DOM element ids as the Extensions API objects. --> <div id="browser"></div> <div id="browser"></div> <div id="chrome"></div> <script src="copy-original-api-objects.js"></script> <script src="browser-polyfill.js"></script> <script src="background.js"></script> </body> </html>