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WEB DEVELOPER TOOLBAR

https://addons.mozilla.org/en-US/firefox/addon/60
A Firefox Browser Add-on (the best one).

There are too many awesome features to this tool to list here, but it is very, very useful, so give it a try! By the way, it's free!

From the site:

"The Web Developer extension adds a menu and a toolbar to the browser with various web developer tools. It is designed for Firefox, Flock and Seamonkey, and will run on any platform that these browsers support including Windows, Mac OS X and Linux."

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