popup.html

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>jQuery UI Accordion - Default functionality</title>
    <link rel="stylesheet" href="./js/bootstrap.css">
    <link rel="stylesheet" href="./js/main.css">
    <script src="js/jquery-3.1.1.js"></script>
    <script src="js/bootstrap.js"></script>
    <script src="popup.js"></script>
    <script src="theme.js"></script>
    <script src="tab_data.js"></script>
  </head>
  <body>

    <div class="container" id="main">
      <ul class="nav nav-tabs">
        <li class="active"><a data-toggle="tab" href="#home">CURRENT ACTIVE WINDOWS</a></li>
        <li><a data-toggle="tab" href="#menu1">SAVED WINDOWS</a></li>
        <li style="max-width:4%"><label class="switch">
            <input type="checkbox" id="theme">
            <span class="slider round"></span>
          </label>
        </li>
      </ul>

      <div class="tab-content">
        <div id="home" class="tab-pane fade in active">
          <div class="panel-group" id="current">
            <!-- Active Windows List -->
          </div>
        </div>
        <div id="menu1" class="tab-pane fade">
          <div class="panel-group" id="saved">
          <!-- Saved Windows List -->
          </div>
        </div>
      </div>
    </div>
  </body>
</html>