AtCoder Bookmarks is a free Chrome extension developed by K4R4. It is designed specifically for users of AtCoder, a popular programming contest platform. This extension allows users to bookmark problems and save them for later review.

With AtCoder Bookmarks, users can easily keep track of the problems they struggled with during their coding sessions. By adding notes and comments, users can record their thought process and any stumbling blocks they encountered while solving a problem. This feature is particularly helpful for users who want to revisit and review problems they have solved in the past.

Using the extension is simple. When on a problem page, users can find a "Save" button next to the explanation tab. Clicking on this button allows users to save the problem for future reference. To access the saved problems and add additional notes, users can simply click on the extension's icon, which opens a list of all the recorded problems. This makes it easy to navigate and review the saved problems, as well as add new notes whenever needed.

AtCoder Bookmarks is a valuable tool for anyone who uses AtCoder for problem-solving. It provides a convenient way to save and review problems, ensuring that users can track their progress and learn from their past experiences. The extension's simple and user-friendly interface makes it accessible to all levels of programmers.