DOM Inspector
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DOM Inspector (DOMi) is one of the web developer tools included in Mozilla Application Suite and Mozilla Firefox. Its main purpose is to inspect the Document Object Model (DOM) tree of HTML and XML-based documents.
A DOM node can be selected from the tree structure, or by clicking on the browser chrome. Besides DOM node, other views are also available, including box model, XBL bindings, CSS style rules, computed styles, and JavaScript objects. Document stylesheets and JavaScript objects can also be selected from the tree. The active element is highlighted with blinking red border, which is helpful in "debugging" CSS.
Other than inspecting, editing is also possible, though not via a rich text interface.