Insofar as ECMAScript provides no way to manipulate HTML or CSS, in Chapters 1–6 we will simply load the following blank HTML document, firebug.html in the downloads at www.apress.com, in Firefox:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Firebug</title>
</head>
<body>
</body>
</html>
But everyone has to start at the bottom.