FF SecurityError: The operation is insecure
===

My code suddenly stopped working after I updated ti IE9 , both IE9 and FF don't work. 

FF gives me 
"SecurityError: The operation is insecure" on the line  
`data: JSON.stringify(someVar),`  

When I am doing jquery ajax call

    $.ajax({
            contentType: 'application/json, charset=utf-8',
            type: "POST",
            url: "/myPage/myMethod",
            data: JSON.stringify(someVar),        
            cache: false,
            dataType: "json",
    ...});

Any ideas why this is happening and what can I do to prevent this? It appears that it's trying to post to a different domain but since this is not the case, why is this suddenly a security issue?
