Firebug integrates with iceweasel/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.

features:

* inspect and edit html
* tweak css to perfection
* visualize css metrics
* monitor network activity
* debug and profile javascript
* quickly find errors
* explore the dom
* execute javascript on the fly
* logging for javascript