FireBug

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Firebug is an extension for Firefox which provides a range of web development tools, including tools to debug, edit, and modify a website's CSS, HTML, DOM, and JavaScript.

The default emerge of Firefox doesn't include the JS Debugger service. That's to say it's built with the flag --disable-jsd set. This means that the Firebug extension for Firefox is little more than an over-sized and empty statusbar. The Same Applies to VenkMan debugger, as they both rely on the same interfaces. To enable it you need to set the USE flag "mozdevelop".