Mammoth Blocker collects no data. It has no account system, no server and no analytics, and it never sends your browsing, settings or anything else off your device.

Blocking is done by the browser's own engine using lists built into the extension. Your settings (category switches, paused sites, custom blocks) and your optional block count are stored only in your browser's local extension storage and are deleted when you remove the extension.

The scam check reads the title, text, address and login forms of the current tab only when you click "Check this page for scam signs". The check runs inside your browser; nothing is sent anywhere and the result is not saved.

Full policy: https://mammothblocker.com/privacy.html