How to debug Javascript/jQuery event bindings with FireBug (or similar tool)

I need to debug a web application that uses jQuery to do some fairly complex and messy DOM manipulation. At one point, some of the events that were bound to particular elements, are not fired and simply stop working.

event.preventDefault() vs. return false

When I want to prevent other event handlers from executing after a certain event is fired, I can use one of two techniques. I'll use jQuery in the examples, but this applies to plain-JS as well:

Removing the dreaded annonymous function event listener

I have a function I’m using to add my listeners to a page but I need a way to globally clear them. No matter how I try, I can’t give the functions a reference to later be emptied completely so they could be re-added later.

How can i make an event to a JComboBox which triggers AFTER selection?

I want to make an event which will be triggered after i make the selection to the JComboBox. the problem I'm now facing is that when i added an ActionListener, it was triggered when the user clicked on the box but BEFORE he actually chose the new item, thus the action listener was activated all the time on the previous value which was selected in the box. what i want to do is simply changing the title of an JTextArea according to the selection. I tried doing something like this: