Ok, that sounds like the Chrome extension that adds "orange lines next to new comments since your last visit", mentioned in this comment (on this same page): ht

Ok, that sounds like the Chrome extension that adds "orange lines next to new comments since your last visit", mentioned in this comment (on this same page): https://news.ycombinator.com/item?id=12664187 https://news.ycombinator.com/item?id=12664187 A button to scroll down to the next unread comment thread sounds interesting.