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You can enable it for non-private windows by setting privacy.trackingprotection.enabled to true in about:config.

• RodericDay 11y ago
  I hate that this is not more visible, like in the Preferences pane.
  • Etzos 11y ago
    It's not in the release channel, but for Nightly the option is there on the Preferences page and has been for quite some time.
    • RodericDay 11y ago
      I use Firefox Developer Edition and it's not there.