fuerstnet

* Use tamperdata to view and modify HTTP/HTTPS headers and post parameters.
* Trace and time http response/requests.
* Security test web applications by modifying POST parameters.

[https://addons.mozilla.org/firefox/966/]

A quick overview of FireBug's features:

* JavaScript debugger for stepping through code one line at a time
* Status bar icon shows you when there is an error in a web page
* A console that shows errors from JavaScript and CSS
* Log messages from JavaScript in your web page to the console (bye bye "alert debugging")
* An JavaScript command line (no more "javascript:" in the URL bar)
* Spy on XMLHttpRequest traffic
* Inspect HTML source, computed style, events, layout and the DOM

[https://addons.mozilla.org/firefox/1843/]