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Thanks for mentioning this! This about:config flag is also available in Firefox ESR 78 already (but there is no GUI for it yet).

• autoexec 6y ago
  Are there about:config entries to handle excluded sites?
  • m4lvin 6y ago
    It seems no / I could not find any.
  • kevinoid 6y ago
    I was interested in this as well. Unfortunately, excluded sites are configured using PermissionManager <https://bugzilla.mozilla.org/1640853 https://bugzilla.mozilla.org/1640853> which stores data in permissions.sqlite.