From webmonkey:
The popular Firefox web development extension Firebug does some pretty cool stuff out of the box: debug JavaScript, tweak the CSS, and see all the network traffic.
Firebug extensions are a sort of meta-extension that lets you add on to Firebug. Developers are adding some features that we’re starting to find hard to live without.
Here we’ll lay out our five faves.
See the List
Related Reading:
Blogs, Wikis, Podcasts, and Other Powerful Web Tools for Classrooms (Multimedia Kit): A Multimedia Kit for Professional Development
Web Analytics 2.0: The Art of Online Accountability and Science of Customer Centricity
Web 2.0: New Tools, New Schools