How Browser Ad and Tracker Blocking Works

Browser content blockers can stop network requests before a resource loads. In Chrome extensions, Declarative Net Request rules let the browser evaluate matching request conditions without running a custom script for every request.

Configured is not the same as active

A saved setting may say ON even if the browser has not loaded the rules. DI VPN's Ad & Tracker Blocker check reads the extension's live session rule counts and requires both ad and tracker groups to be present before it reports active.

Why some ads may still appear

Filtering lists have finite coverage. First-party ads, new domains, cosmetic overlays and content delivered from the same host as the page may not match a network rule. No rule count guarantees that every ad or tracker on every website will be stopped.

Check your configuration

Enable the blocker in the extension, then run the first-party status check. Use a range of ordinary websites to evaluate behaviour; do not submit passwords or private browsing content to a third-party test page.