In Chrome you can get the event listeners for a given element by selecting/highlighting it in the Elements tab, then jumping across to the Console tab, you use:

  getEventListeners($0)

getEventListeners is a Chrome console/devtools only function and $0 is a console placeholder variable for the currently selected element.

It's definitely not the nicest way to find things and you often end up running into the minified/uglified madness when delving deeper, but sometimes it helps do the trick.