Mozilla browser Container Extension

How many of you have used the new Mozilla "face book" extension for its Firefox browser that isolates the Facebook identity of users from rest of your web activity ??
Facebook Container Extension, once installed in the user’s Firefox browser, makes it harder for Facebook to use cookies to track what they do on other sites. Upon installing the extension, Facebook Container will delete any existing Facebook cookies and then long the user out of their account. That user then logs back in, at which time the tab will show up with a blue color to indicate its container status.
Within that tab, the user is able to use Facebook like usual, including clicking links to other sites. Any link that takes the user to a non-Facebook destination will open in a different tab outside of the container. “This makes it harder for Facebook to track your activity on other websites via third-party cookies,” Mozilla explains.
There is some minor inconvenience associated with the tab, namely that external like and share buttons on other sites may not work. That is intended to prevent the social network from associating activity data with the Facebook user.
Anyone found any problems with it ?

Thanks
Chuck