The Facebook Container extension for Firefox helps you take control and isolate your web activity from Facebook. Facebook Container works by isolating your Facebook identity into a separate container that makes it harder for Facebook to track your visits to other websites with third-party cookies.
Installing this extension deletes your Facebook cookies and logs you out of Facebook. The next time you navigate to Facebook it will load in a new blue colored browser tab (the "Container"). You can log in and use Facebook normally when in the Facebook Container. If you click on a non-Facebook link or navigate to a non-Facebook website in the URL bar, these pages will load outside of the container. Clicking Facebook Share buttons on other browser tabs will load them within the Facebook Container. You should know that using these buttons passes information to Facebook about the website that you shared from.