The HTML listbox has an "onchange" event which is fired whenever the item selected in the listbox has been changed. The contents of the listbox can be changed either by clicking the corresponding item from the listbox or by using the up and down arrow keys or pressing the beginning alphabet of any of the items when the listbox has focus. Ideally, even when changing the selected item by using the keyboard, the onchange event should be fired. In fact, the event is fired in all major browsers except Firefox. With Firefox, the onchange event is called only when the listbox loses focus.
<select id="items" onchange='itemSelected();' onkeyup="this.blur();this.focus();">
All that needs to be done is to momentarily remove focus from the listbox so that the onchange event is called and then, set the focus again. Setting the focus again on the listbox is needed because, if we don't do that, the user will have the set the focus explicitly on the listbox every time he changes it's value with the keyboard - he wouldn't appreciate this if he wants to select a value which is 4-5 values further in the list from where he's currently at.
I spent nearly 2 hours trying to figure out why the onchange event wasn't getting called in FireFox. Hope this post will go some way in helping you reduce the debugging time in case you happen to come across a similar situation.