Can't load xml within jquery submit function with Firefox, Ok with Chrome

The following works on Chrome but not Firefox ...

$('#foo').submit(function () {

    $.get('externals/xml/college.xml', function(d){  

开发者_StackOverflow社区With firebug I can see the Get but it does not return any response and is highlighted red with a red X. There are no other console error messages.

I open the same file on document ready so the submit results in a re-read of the xml. The initial .get at document ready works with all browsers.

Any thoughts on what could be causing this?