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It's been discouraged since its inception, but has now officially been deprecated as of Chrome 40 and Firefox 30. > 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/. http://updates.html5rocks.com/2012/01/Getting-Rid-of-Synchronous-XHRs For the web's integrity, it's unlikely the features will be removed. Though new features are requirement to not allow use of these (e.g. XHR2 features only work asynchronous). While the deprecation reasons (performance( are reason enough, having these in our code base is an additional blocker for improvements of the lower level interfaces.