This extension opens the Hacker News comment thread for your current page
This extension lets you backtrack to the Hacker News comment thread to a page without having to find the link again on HN. Let's say you have 9000 tabs open, and you come across something you know came from HN, but probably two days ago, and you want to see the dialog about it without too much fuss. Just click the icon and it'll open a new tab to the comments thread for your page. If there is no comment thread which matches your page exactly, it'll give you the thread for the latest submission where the URL is a superstring of your URL.