[jQuery] Cross domain with $.ajax(url : 'http://someWhereElse.aspx')

[John Ruffin]

I've read through a number of posts regarding cross domain issues and
the "Access to restricted URI denied (NS_ERROR_DOM_BAD_URI) "
exception.

I have a $.ajax( url : 'https://somedomain.com/secure/somefile.aspx')
call.  This works in IE but not in Firefox.  In FireFox I get the
above exception.  In IE I get the desired response back from the
*.aspx page.

What's the best practice for this remote domain call scenario?
($.getJson(), $.getScript(), etc...)