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I believe this is privacy.firstparty.isolate in about:config, if you want to do this manually

• fragileone 5y ago
  That's not for the Dynamic version as far as I'm aware.
  • OminousWeapons 5y ago
    Is there a way to enable the dynamic version via about:config to your knowledge?
    • maverick74 5y ago
      Take a look at: https://techdows.com/2020/04/enable-dynamic-first-party-isolation-firefox.html https://techdows.com/2020/04/enable-dynamic-first-party-isol...