@mcc I didn't check Bugzilla because the Mozilla Bugzilla makes me head hurt every time, but in case it hasn't come up yet: "Privacy-preserving ad measurement" apparently does _not_ get disabled by the DisableTelemetry group policy setting (mozilla.github.io/policy-templ) based on quick testing on Windows with 128.0. So not only does Mozilla opt you in by default, they also seem to bypass what's supposed to be a global telemetry opt-out. (I didn't check effects on actual data transmitted, just how the Settings UI changes when toggling group policies.)