Sometimes comment threads get really long on HN and if I try to scroll up to traceback to the parent, I get confused. I could click on the link to the comment, then click "parent", but that takes me out-of-context. So I put together this bit of JS to do a popup that shows me the parent comment without having to scroll anywhere or change what I'm currently looking at. Just an idea I was playing with. You can paste it into firefox console. There's no license or anything; I don't care what happens to this code or if I don't get credit for it in someone else's app/extension/whatever. I just want people to think about this concept. It'd be cool if HN just built this into the site; maybe account-option to turn it on/off.