Yeah, for some reason on my firefox mobile (stable) the history list disappears immediately after releasing the long press, making the selection of a specific history item impossible :S
In any case, why does the site pollute the history with what are effectively noop items?
If the intention is to prevent the user from going back to previous question, it would be better to change the behaviour of the request and make t client side rather than highnacking the back button like most slide show websites do.
Edit: I couldn’t even spam back to get out, it would go back and then pull me forward to next question. I had to just change the URL back to HN.
You get the answer, when you get something wrong the question is asked again at the end until you get it write.