Does this make Firefox's Multi-Account Containers obsolete? I just finished setting the smart cookie-grouping extension up, but it seems like this serves a functionally similar purpose.
Multi-Account Containers remains important for managing "real" cookies used as intended (signed in account information, for instance). These "supercookies" are parts of the web experience abused for tracking and at least partly orthogonal to what Multi-Account Containers helps manage.
