I was also curious. It appears they used Normandy. From the Mozilla website: "Normandy Pref Rollout is a feature that allows Mozilla to change the default value of a preference for a targeted set of users, without…
I was also curious. It appears they used Normandy. From the Mozilla website: "Normandy Pref Rollout is a feature that allows Mozilla to change the default value of a preference for a targeted set of users, without…