Hacker News OnePage is a free Chrome extension developed by Tim Dupree. It falls under the category of Browsers and belongs to the subcategory of Add-ons & Tools. This extension provides users with the convenience of browsing Hacker News articles and comments without having to leave the page.

With Hacker News OnePage, users can view news articles in a left column while simultaneously viewing the article or comments on the right. This eliminates the need to navigate away from Hacker News in order to read or engage with the content. Additionally, OnePage highlights the articles and comments that users click on, making it easy to keep track of what has been read.

Overall, Hacker News OnePage is a useful tool for Hacker News enthusiasts who want to streamline their browsing experience and stay engaged with articles and comments all within a single page.