app/popup.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>memm</title>
<meta http-equiv="Content-Security-Policy" content="script-src 'self' blob: filesystem: moz-extension: chrome-extension-resource: 'unsafe-eval'">
</head>
<body>
<div id="mount"></div>
<script type="text/javascript" src='popup.js'></script>
</body>
</html>