> I had an Android device, but now I have an iPhone. In addition to the
> popup problem, and the fake "X" on ads, the iPhone browsers (Safari,
> Chrome, Opera) will start to show a site, then they will lock up for 10-30
> seconds before finally becoming responsive.

Via. Ask Slashdot:

Note: Starting with Gecko 30.0 (Firefox 30.0 / Thunderbird 30.0 / SeaMonkey
> 2.27), synchronous requests on the main thread have been deprecated due to
> the negative effects to the user experience.


Heads up! The XMLHttpRequest2 spec was recently changed to prohibit sending
> a synchronous request whenxhr.responseType is set. The idea behind the
> change is to help mitigate further usage of synchronous xhrs wherever
> possible.

Via http://updates.html5rocks.com/2012/01/Getting-Rid-of-Synchronous-XHRs

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