Played around a bit with Eventbug. With the new API in firefox 3.7a1pre it is now possible to list the event listeners defined on a page. Eventbug is an extension for Firebug, which adds a new tab ‘Events’ which neatly displays all the defined event listeners. There is an events tab under the HTML tab as well, which is really helpful to find out the event listeners on the currently selected element.
There are some features missing as already noted by the author. But for an alpha release, it really rocks!
