Hunting for bugs. Warm up for web developers

Yes, sometimes life presents us with unpleasant moments, for example, like this one that I suggest you fight with.

And so, to begin with, everyone will need the latest laboratory build of the opera . Well, then only your skills and favorite work tools. Apparently the bug is played only on the win platform.

Actually, our goal while scrolling the browser is tightly hanging, which has not happened for a long time. It has been empirically established that the case is most likely in javascript. Disabling javascript'a removes hang. And so, who will find where the "treasure" is buried?

Anyone not tempted to dig just like that, I can offer a symbolic prize of $ 1-3.
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Victory conditions : a page containing testcase that reproduces the situation.

I declare the hunting season open.