Onkeydown wont fire properly in Firefox or Google Chrome.

Try adding "event" as an argument to convertEnterToTab:

<script type="text/javascript" language="javascript">
    function convertEnterToTab(event) {
      if(event.keyCode==107) {
        event.keyCode = 9;
      }
    }
    document.onkeydown = convertEnterToTab;    
  </script>

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Nope.  Didn't work sjklein42

Based on what I've learned, the way you pick up the event is different in IE and Firefox.  Also whether the event is writable or readonly.

In Firefox, you must pick up the event as an argument.  Not so in IE.

In Firefox, the event is read-only, so you must create and dispatch a new event based on the old one, and then cancel the old event before it gets executed.

I found a couple examples and came up with this code, which "should" work but doesn't.  For some reason, even though the new event is being dispatched, it is not having any effect.

(By the way, if you are not already using the Firebug add-on to Firefox, I strongly recommend you install it right away.)

<script type="text/javascript" language="javascript">

function convertEnterToTab(winEvent) {
	var keyCode;     // event passed as param in Firefox, not IE where it's defined as window.event
	if(!winEvent) {
		winEvent = window.event;
		keyCode = winEvent.keyCode;
		if(keyCode==107) {
			winEvent.keyCode= 9;
		}
	}
	else {			 // ff
		keyCode = winEvent.which;
		if(keyCode==107) {
			var newEvent = document.createEvent("KeyboardEvent")
			newEvent.initKeyEvent("keydown", true, true, document.defaultView, false, false, false, false, 9, 0)
			winEvent.preventDefault()
			winEvent.target.dispatchEvent(newEvent)
		}
	}
}

document.onkeydown = convertEnterToTab;    

</script>

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I kept trying, and then found this.  The plot thickens:

http://forums.mozillazine.org/viewtopic.php?f=19&t=665240

(no solution posted)