FireBug is a Firefox extension that allows you to explore the far corners of the DOM by keyboard or mouse.

All of the tools you need to poke, prod, and monitor your JavaScript, CSS, HTML and Ajax are brought together into one seamless experience, including a debugger, an error console, command line, and a variety of fun inspectors.

Here are some key features of "FireBug":

Ссылка: https://addons...efox/downloads/file/136092/firebug-1.8.4-fx.xpi