Synchronous XMLHttpRequest on the main thread is deprecated

[zaasmi]

Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user’s experience. For more help, check https://xhr.spec.whatwg.org/.

n.username ? a.open(n.type, n.url, n.async, n.username, n.password) : a.open(n.type, n.url, n.async);