options.html

<!DOCTYPE html>
<html>
   <head>
      <title data-l10n-id="optionsTitle"></title>
      <style>
        ul {
          list-style: none;
          padding-left:0;
        }
        body {
        white-space:nowrap;
        }
      </style>
   </head>
   <body>
      <h1 data-l10n-id="optionsTitle"></h1>
      <ul>
         <li><input type="checkbox" id="enable" class="checkbox"><label for="enable" data-l10n-id="optionsEnable"></label></li>
         <li><input type="checkbox" id="block_60fps" class="checkbox"><label for="block_60fps" data-l10n-id="optionsBlock60fps"></label></li>
         <li><input type="checkbox" id="battery_only" class="checkbox"><label for="battery_only" data-l10n-id="optionsBatteryOnly"></label></li>
      </ul>
      <script src="options.js"></script>
   </body>
</html>