Frankly, these secret prefs are basically either: - prefs that a developer was too lazy to add to the list of pref; or - prefs that serve only during automated

Frankly, these secret prefs are basically either: - prefs that a developer was too lazy to add to the list of pref; or - prefs that serve only during automated tests. You could scan source code for `Services.prefs` and `nsIPreferenceService` if you really want to find them.