Confirm
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Changes
→Supported Study and Messaging Designs
; Preference-flip to control feature
; PreferencPreference-flip to control (disabled by default) system addon
; Add-on Based study (opt-in) [[Firefox/Shield/Shield_Studies|Shield Studies]]
; Add-on Based Study (opt-out) [[Firefox/Shield/Shield_Studies|Shield Studies]]
; Pioneer: On-going opt-in cohort for deeper data collection
; Rollout preference study
=== Choosing A Design for Evaluating Features ===
