Synchronous XMLHttpRequest warning and [removed]

Question

I\'m getting a warning message:

Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user\'s expe

Answer 1

In my case this was caused by the flexie script which was part of the "CDNJS Selections" app offered by Cloudflare.

According to Cloudflare "This app is being deprecated in March 2015". I turned it off and the message disappeared instantly.

You can access the apps by visiting https://www.cloudflare.com/a/cloudflare-apps/yourdomain.com