I'm using jQuery to initiate the download of large files via an iframe (so as not to lock up the browser). If I remove that iframe from the DOM in FF the save dialog will not appear since the window that initiated it no longer exists. However, in IE, even when I remove the iframe from the DOM the process of downloading continues, and the save dialog will eventually appear. The code looks a little like this:
To add:
$("#my-id").append("<iframe id='my-iframe' src='my.zip' style='visibility:hidden' />");
To remove:
$("#my-iframe").remove();
I read something about contentWindow.execCommand in IE, but there is no command identifier that works to "stop" the processing of a URL.