A Firefox-derived build may expose a choice about marketing measurement or communications. The present Nirvana website has no newsletter signup or custom marketing profile form.
Open Settings → Data collection and inspect any Marketing data switch. The reviewed source sets marketing telemetry off by default, but a production APK audit is still needed to confirm the exact fields and destination.
Google Play, search providers and websites you visit run their own services under separate policies. Turning off a Nirvana marketing switch does not change those third parties’ settings.
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