I use Hacker News Enhancement Suite for this. On the front page it shows total number of comments, and new comments since you last viewed a submission. Comment

I use Hacker News Enhancement Suite for this. On the front page it shows total number of comments, and new comments since you last viewed a submission. Comment trees with new replies are all highlighted with a dark orange, while the new replies themselves are highlighted with a bright orange. It also adds collapsible comment trees, inline commenting and other features I'm probably not even aware of. [0] https://chrome.google.com/webstore/detail/hacker-news-enhancement-s/bappiabcodbpphnojdiaddhnilfnjmpm?utm_source=chrome-app-launcher-info-dialog https://chrome.google.com/webstore/detail/hacker-news-enhanc...