Duplicate Tabs Closer is a Firefox extension designed to streamline tab management by detecting and closing duplicate tabs. Users can choose from various options for handling duplicates, such as automatically closing them or simply monitoring their presence with a badge notification. The extension also allows for customization of how remaining tabs behave after duplicates are closed, offering flexibility to suit individual browsing habits.

In addition to basic functionality, Duplicate Tabs Closer includes advanced filtering options that let users ignore specific URL components and customize the scope of duplicate detection across different windows and containers. The extension also features customizable badge colors to visually indicate the presence of duplicate tabs, enhancing user experience and efficiency in managing multiple tabs.