From #33534: Firefox 78 offers several new first-party isolation features (off by default). Should we enable them? - https://bugzilla.mozilla.org/show_bug.cgi?id=1639807 - Isolate image cache per first-party when privacy.partition.network_state is set to true) - https://bugzilla.mozilla.org/show_bug.cgi?id=1639154 - Isolate network cache per first-party when privacy.partition.network_state is set to true) - https://bugzilla.mozilla.org/show_bug.cgi?id=1639247 - Isolate DNS cache per first-party when privacy.partition.network_state is set to true)