Not Twice: Bookmark Reminder & Manager is a Chrome extension designed to enhance bookmark organization and retrieval. It offers several key features to optimize bookmark usage, including notifications for related bookmarks when selecting text, allowing users to quickly access relevant saved items. The extension's interface includes an 'AllBookmarks' tab for easy keyword searches, making it simple to find specific bookmarks among a large collection.

Additionally, Not Twice provides a 'CleanUp' feature that identifies bookmarks not accessed in the last three months, enabling users to delete unnecessary entries and streamline their collections. The 'Recently Added' tab allows for quick access to newly saved bookmarks, ensuring that users can keep their favorite links organized and readily available, enhancing overall browsing efficiency.