Do they? I seem to remember a great kerfuffle somewhat recently over telemetry being opt-out. Studies _must_ be opt-out given the amount of users Mozilla says

Do they? I seem to remember a great kerfuffle somewhat recently over telemetry being opt-out. Studies _must_ be opt-out given the amount of users Mozilla says the fix covers, and they're basically a form of telemetry, in their intended use anyway.