Arboreal Arboreal is a Firebug UI enhancement which adds a HTML sidepanel for DOM tree visualization. Watch a screencast! Arboreal is entirely written in JavaScript. The algorithm to produce the tidy node-link tree layout is that of Christoph Buchheim, Michael Jünger and Sebastian Leipert from their research paper entitled 'Improving Walker's Algorithm to Run in Linear Time', Graph Drawing 2002. S