Today’s release of Total Cookie Protection is the result of experimentation and feature testing, first in ETP Strict Mode and Private Browsing windows, then in Firefox Focus earlier this year. We’re now making it a default feature for all Firefox desktop users worldwide.
Thank you for your reply. What you described looks a lot like First Party Isolation: https://www.ctrl.blog/entry/firefox-fpi.html I don’t see how this is different, save for the fact that Total Cookie Protection (TCP… never seen this acronym before lol) does less than FPI.
FWIW, Total Cookie Protection was previously called Dynamic First Party Isolation and it is indeed one of the FPIs.
The name is mentioned in the Firefox Security Newsletter as follows:
Thank you for the clarification 👍🙏