Facebook Container is a Firefox extension designed to enhance user privacy by isolating Facebook activity from broader internet usage. When installed, it automatically closes any open Facebook tabs, deletes existing Facebook cookies, and logs the user out of Facebook. The next time Facebook is accessed, it opens in a distinct blue-colored tab, ensuring that all interactions are contained within this secure environment. While using this extension, links to external sites will open outside the container, effectively preventing Facebook from tracking activity across the web.

This extension does not protect against Facebook's access to data already collected or submitted while logged in. It also limits functionality on websites that rely on Facebook for login or comments. Users are encouraged to combine this tool with additional privacy settings in Firefox, such as enabling Tracking Protection and blocking third-party cookies. Overall, Facebook Container provides a focused solution for those looking to maintain privacy while using Facebook.