Why is Opera executing javascript from stackoverflow comment?

I noticed weird opera activity, especially when I killed the browser with open tabs and started it again, and executed js from this page: display a message in asp.net And I saw the "Login successfully" warning

This happens every time I force a restart.

How is this possible?

http://i.stack.imgur.com/7qWTG.jpg

I am using Opera 24.0.1558.61 Win8.1 x64

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It turns out it's not caused by Opera at all. It was a faulty third party extension that breaks on this website. The same extension breaks the same way in other supported browsers under given conditions.



If you discover a security vulnerability in Opera, you can confidentially report it to the Opera bug tracker. We would be happy to thank you for responsible disclosure if we find it usable.

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