If i redirect on the callback of getJSON and then use the back button on the browser, the displayed page is not the exepted one. (tested on FF3.5).

Here is a test code :

<a class="btTest">Test</a>

<script type="text/javascript">

$('.btTest').click(function() {

$.getJSON('http://maps.google.com/maps/geo?callback=?', function() {

window.location = 'http://google.fr';

});

});

</script>

I found a hack :

Handle JSONP-style loading

window[ jsonp ] = function(tmp){setTimeout(function() {

data = tmp;

success();

complete();

Garbage collect

window[ jsonp ] = undefined;

try{ delete window[ jsonp ]; } catch(e){}

if ( head )

head.removeChild( script );

}, 1);};