// installs count Chrome Web Store downloads; the big chart counts distinct anonymous IDs reporting that day — most installs never report (telemetry launched 2026-07-09), so the two are not comparable.
// zero-activity daily reports still count as active — they anchor the retention denominator.
// retention = distinct active days per user across all cohorts — not days-since-install. A one-day user is real (installed, then the browser never reported again), not a tracking artifact.
// test installs excluded — real Chrome Web Store users only.