The CSES Extension is a free Chrome add-on that enhances the user experience for those tackling problems on the CSES Problem Set. Key features include the ability to add personal notes directly on the CSES page, which allows users to keep track of hints, mistakes, and custom logic for future reference. Additionally, users can view global and category-specific statistics to monitor their progress and problem-solving efficiency. The extension also provides quick copy buttons, text submission for code, and sorting and filtering tools to streamline navigation.

Further enhancing productivity, the CSES Extension includes features like tags for problem types, hints for guidance, and an expected time complexity display for each problem. With automation tools such as auto login and theme switching capabilities, the extension prioritizes user convenience while ensuring privacy, as it does not collect or share personal data. Future updates are planned to improve the dashboard and integrate with cloud services for better note management.