Hacker News Highlighter is a free Chrome add-on designed to improve user engagement with Hacker News by highlighting new articles and those with significant comment activity. Upon each reload of the front page, newly added headlines are distinctly marked, allowing users to quickly identify fresh content. The add-on emphasizes articles that have garnered a high number of comments, making it easier to find popular discussions.

In addition to its highlighting features, Hacker News Highlighter enhances navigation by ensuring that both article and comment links open in new windows. This functionality allows users to explore content without losing their original position on the Hacker News feed, promoting a more efficient and enjoyable browsing experience.