Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check http://xhr.spec.whatwg.org/.
****// Open the socket
// Passing null username, generates a login popup on Opera (#2865)
if ( s.username ) {
xhr.open( s.type, s.url, s.async, s.username, s.password );
} else {
xhr.open( s.type, s.url, s.async );
}****
How to solved this?