Free Firefox Web Developer Tools

http://www.lockergnome.com/craighton/2011/11/30/10-web-developer-firefox-add-ons/

Probably the two most important tools for a Web developer are his or her text editor of choice and browser. If the preferred browser happens to be Firefox, then Craighton Miller helps you out here with 10 of his recommended Firefox add-ons geared toward assisting Web developers — from novices to experts.

You can watch the entire live TLDR episode here:
http://www.youtube.com/watch?v=wseuDFo-4Cs

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