Firebug is absolutely my favorite addon to FireFox. It is an extremely powerful tool for diagnosing issues, as well as for development. Here is a brief video tutorial I did showing you some of the basics of using this great tool.

Firebug is a free addon for Firefox that gives you some powerful development tools. It can help you diagnose issues in code, find where to change something in the code and even make those changes and preview them instantly.

This 8-minute tutorial walks you through how to install and use Firebug.

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Firebug – Firefox Addon Video Tutorial