Tim Anderson reporting via The Register: The first thing users will see after updating to Mozilla's latest browser, Firefox 74, is a prompt to install the Facebook Container add-on. The Facebook Container add-on is not new, but has been enhanced in its latest version, 2.1.0, with the ability to add custom sites to the container so that you can "login with Facebook wherever you need to." The purpose of the Facebook Container is to let you continue to use Facebook but without having the social network site track your browsing elsewhere. "Installing this extension closes your Facebook tabs, deletes your Facebook cookies, and logs you out of Facebook," say the docs.
When you visit Facebook and log in, the cookies it plants are isolated to the container. This prevents Facebook Like buttons and embedded comments from working on other sites. There is also an issue with sites that require or offer a Facebook login, which you can now overcome by adding those sites to the container. Sites are added by clicking a fence icon and selecting "Allow site in Facebook container." The effect is like having two web browsers, one in which you are logged into Facebook and subject to potential tracking on any site which has Facebook content, and another where Facebook has no knowledge of you.
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