Web development plugins and tools

Fiddler - Web Debugging Proxy
For linux use firebug (free) inside firefox or use
Charles - web debugging proxy $50
WireShark - cross platform network protocol analyzer

FireFox plugins:
Tamper Data: Use tamperdata to view and modify HTTP/HTTPS headers and post parameters. Trace and time http response/requests.

Web Developer: Adds a menu and a toolbar to the browser with various web developer tools.

FireBug: You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.

IE
Developer Toolbar

Eclipse
ATF JavaScript Debugger Also available from eclipse.org/atf

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