DOM Monster is a cross-platform, cross-browser bookmarklet that will analyze the DOM & other features of the page you’re on, and give you its bill of health.

Just install the DOM Monster bookmarklet, and use it on any web page or app. If there are problems, DOM Monster will point them out and even make suggestions on how to fix ‘em.

DOM Monster is the answer to JavaScript performance tools that just don’t give you the full picture.