“Total cookie protection” is now standard in Firefox

In early 2021, Mozilla introduced a new test feature in the Firefox browser that will reduce the risk of you being tracked between different websites. This is called total cookie protection and means that cookies are stored in separate containers for each website you visit.

For example, say you visit example.com which has Facebook code embedded. Then cookies for Facebook will be saved in a separate container for example.com. Facebook code on example.se does not access that cake but gets its own in a container for that website. Code on facebook.com itself accesses cookies that belong there but not other cookies for Facebook code embedded on other websites.

Mozilla now announces that total cookie protection has become standard for all Firefox users on Windows, Mac and Linux.

In addition to cookies, Firefox saves a large number of other data in separate containers per domain. Cache storage of everything from favicons to dns-answers and tls-certificates is always separated by domain, while some other data such as databases and saved files (and cookies) are normally stored separately but can access a common container in two ways:

• Automatically for, for example, third-party login (“log in with Google” and the like).
• Via the Storage Access api where a website explicitly asks the user for access to commonly stored information. Examples could be cloud storage with locally cached files that you want to access from another website.

Read more in Mozilla developer documentation.