Very Useful Firefox Add-on for Web (esp. CSS) Developers

[Wordzilla]

Web Developer toolbar for Firefox 1.0 - 2.0.0.* by Chris Pederick

IMO, an absolute must for everybody who's doing web development (and particularly css development).

Get it free from: https://addons.mozilla.org/firefox/60/

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[Softland]

Is this better than Firebug (http://www.getfirebug.com/)?

[Wordzilla]

Wow, another must have for web development! Thanks for sharing Softland.

p.s. Would you like to make a post (separate topic) about Firebug so we can blog it? I think many ppl here will like it too.

[dk70]

Check this video where author of Firebug presents version 1.0 http://yuiblog.com/blog/2007/01/26/video-hewitt-firebug/

[2stepsback]

http://livehttpheaders.mozdev.org/

http://firefox.exxile.net/aios/index.php

http://diveintogreasemonkey.org/ <-- Greasemonkey needs some time and learning, but once you're done, it transforms you into a Jedi knight wielding the Firefox light sabre. Awesome.