Firebug

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From the Firebug website: 

Firebug integrates with Firefox to put a wealth of
web development tools at your fingertips while you browse.
You can edit, debug, and monitor CSS, HTML, and JavaScript
live in any web page.

If you're doing any FBJS it is essential that you use this tool to help you debug and diagnose any problems you're having.

Plus, it's a great tool for inspecting CSS of an existing page (for example if you want to 'borrow' some of facebook's existing CSS for your page).

[edit] External Links

Intro Movie -- An introductory video by the creator of Firebug giving you an inside look at all its powerful features.

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