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Probably a known issue but the confirm_popup (and probably more) does not work with the WebKit driver.
Note: The WebKit driver will automatically go past any confirm checks normally, but attempting to direct the flow with the confirm_popup method causes a method not found exception.
@DArrigoni I haven't tested this against webkit yet, but I will have a look as soon as I get some time.
In prickle v0.0.6 you can handle webkit popups. There is more info in the README.