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If you enable the First-Party Isolation preference in about:config then this is more effective site isolation and is automatic for all sites.

• liminal 6y ago
  Are there downsides to this? Settings aren't usually hidden in about:config without a reason
• jonnytran 6y ago
  Do you use this for every day browsing? Does it break anything?
  • ffpip 6y ago
    Yes.No, it does not break anything for me, and I browse a ton of websites.