{ ffLib }: {
  # https://blog.mozilla.org/firefox/update-looking-glass-add/
  # https://mozilla.github.io/normandy/user/end_user_interaction.html#opt-out-preference
  policies = {
    DisableFirefoxStudies = true;
  };

  preferences = {
    app.shield.optoutstudies.enabled = false;
  };
}