To help Firefox users have more control of their data on Facebook, we’ve created the Facebook Container Extension.
This extension helps you control more of your web activity from Facebook by isolating your identity into a separate container.
That includes us: Mozilla does not collect data from your use of the Facebook Container extension.
When you install this extension it will delete your Facebook cookies and log you out of Facebook.
Should you click on any Facebook Share buttons on other browser tabs it will load them within the Facebook container.
Also, because you’re logged into Facebook in the container tab, embedded Facebook comments and Like buttons in tabs outside the Facebook container tab will not work.
This prevents Facebook from associating information about your activity on websites outside of Facebook to your Facebook identity. »