Firefox’s Coming Developer Tools

 Firefox is poised to deliver some new tools for web developers. When Firefox 10 is released in early 2012 it will add HTML and CSS inspectors designed to help web developers inspect and debug their code. Later releases will add more features, like a 3-D page inspector and even a built-in code editor… “

Source:  Webmonkey | Wired.com
More  An Overview of Firefox’s Coming Developer Tools