Re: [w3ctag/design-reviews] First-Party Sets (#342)

>  Our state partitioning feature applies to all third parties and does not use an entity list. We have no plans to add one. It does automatically relax partitioning under a variety of circumstances [documented here](https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Privacy/State_Partitioning#dynamic_state_partitioning) for webcompat reasons. But we're working to figure out how we can narrow these over time with the goal of removing them entirely at some point.

@englehardt - Is my understanding correct that this mechanism is only in place for opt-in ETP Strict mode? Are you on track to make it the default?

Are you investing in APIs other than Storage Access API to help remove the current heuristics?

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