The Web Developer extension adds a menu and a toolbar to the browser with various web developer tools. It is designed for Firefox, Flock, Mozilla and Seamonkey, and will run on any platform that these browsers support including Windows, Mac OS X and Linux.
https://addons.mozilla.org/en-US/firefox/addon/60
What are Add-ons?
Add-ons are small pieces of software that can add new features or tiny tweaks to your Firefox. They can add new search engines or dictionaries in other languages, change the look of Firefox with a new theme, or much more. Take a look around and see what add-ons can do for you.
Ofcouse IE doesn't have such advanced features!! ;)
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