Extenssr is a free Firefox extension designed for gamers looking to enhance their gameplay with various features. This versatile tool supports co-op mode, allowing users to engage with friends or other players seamlessly. Additionally, it introduces a country streaks mode that can be utilized on any map, providing players with an engaging way to track their performance across different regions. The extension also offers capabilities to show exact locations for completed Battle Royale rounds, ensuring players can analyze their strategies effectively.

Beyond these functionalities, Extenssr includes filtering effects on the map, which can greatly assist in customizing the gaming experience. With a wide range of features available, users can explore the complete list through the provided resources. This extension is a valuable addition for those looking to optimize their gaming sessions and gain a competitive edge.