A step-by-step description of each key feature is provided with the help of simple, easy-to-understand examples. There are plenty of useful screenshots in each chapter. Every chapter contains information as well as tips and tricks to draw your attention towards some useful information or reference. Each aspect of web development like CSS or JavaScript is handled independently so that you can refer to those modules in which you are interested. This book is written for frontend web developers building software and pages using HTML, CSS, JavaScript, and AJAX, who want to learn Firebug for the reasons outlined above. The book assumes that readers have a very basic knowledge of HTML, JavaScript, and CSS. The examples in the book can be understood by someone who has just been introduced to web development.