Firebug
Firebug is a powerful Free and Open Source Add-on for Firefox and is very famous among web developers. With FireBug, you can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.
It has tones of useful features like a dynamic console, DOM tree explorer, CSS viewer/editor, script explorer and network monitor where you can see all Flash, XMLHttpRequest, JS and Image requests. Firebug is mainly used by web developers to trace bugs in their code but it can also be used to find and explore various browser and remote site vulnerabilities.
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