From the console you can usefully monitor events with the monitorEvents API. The API takes an object to be monitored and then an event to listen for. For example:
monitorEvents(document, ["scroll"]);
monitorEvents($('#action-button'), ["mousedown", "mouseup"]);

To stop monitoring events, simply call unmonitorEvents() passing the object to stop monitoring on.
unmonitorEvents(document);
Monitor the scroll event on the following element textfield