What Is DoH Blocking and How to Prevent Hidden Telemetry?

Modern browsers enable DoH (DNS over HTTPS) by default. While this encrypts your DNS lookups, it also routes them to centralized Google or Cloudflare servers, bypassing local firewalls and harvesting telemetry.

Forcing Local Filtering Over External DoH Queries

DoH bypasses your operating system's local hosts file. AdBlock Network addresses this within the tab process. The extension performs asynchronous read-only requests to multiple independent endpoints to refresh its perimeter rules, dropping ad connections via the Address layer before the browser attempts a DoH lookup.