Just Ad Blocker does not collect, store, or transmit any personal data. It contains no analytics and no remote servers, and makes no network requests of its own. User preferences (such as the enabled state and per-site whitelist) are stored only in the browser's local storage on the user's device and never leave the device.

Full privacy policy (English and Traditional Chinese): https://github.com/ivanusto/just-ad-blocker/blob/main/PRIVACY.md