* <tt>privacy.trackingprotection.ui.enabled</tt>: show a checkbox to toggle <tt>privacy.trackingprotection.enabled</tt> in the Preferences ('''Nightly''' only)
* <tt>privacy.trackingprotection.introCount</tt>
* <tt>privacy.trackingprotection.introURL</tt>: URL that kicks off the UI tour (target of the "See how this works" button in <tt>about:privatebrowsing</tt>)
* <tt>urlclassifier.disallow_completions</tt>: list of tables for which we never call <tt>gethash</tt>
* <tt>urlclassifier.trackingTable</tt>: list of tables to use when looking for trackers (they need to be named <tt>*-track-*</tt>)