Smart Prevent Duplicate Tabs is a Firefox extension designed to improve browser efficiency by preventing the automatic creation of duplicate tabs. This add-on automatically closes repeating tabs based on user-defined settings, allowing for a more organized browsing experience. Users can easily activate or deactivate the extension without navigating away from their current tasks, ensuring seamless usability.

The extension also supports incognito mode, maintaining a clear separation from regular browsing activities. Users can customize their experience by adding exceptions for specific URLs and deciding whether to include query strings and hashes when identifying duplicates. With various configuration options, including which tabs to close and when to trigger the closing action, this tool is a valuable addition for those looking to streamline their tab management.