auth/chromextension/background.html

<!DOCTYPE html>
<!--
Copyright (c) 2016 Google Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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<html>
<head>
  <meta charset=utf-8 />
  <meta name="viewport" content="width=device-width, initial-scale=1.0">

  <title>Google Sign In in Chrome Extensions Example</title>

  <link rel="stylesheet" href="main.css">

  <!-- ***************************************************************************************
       * TODO(DEVELOPER): Make sure you are importing the latest version of the Firebase JS. *
       *************************************************************************************** -->
  <script src="https://www.gstatic.com/firebasejs/3.3.0/firebase.js"></script>
  <script src="background.js"></script>
</head>
<body>

</body>
</html>