A Firefox extension that enables and manages Firefox's built-in adblock-rust engine — Brave's open-source, Rust-based ad and tracker blocking engine, quietly shipped in Firefox 149.

Background

In March 2026, Firefox 149 silently shipped adblock-rust — the same Rust-based content blocking engine that powers Brave's native ad blocker. It supports network request blocking, cosmetic filtering, and is fully compatible with uBlock Origin filter list syntax.

Mozilla shipped it disabled by default , with no user interface and no mention in the release notes. It is controlled exclusively by two about:config preferences:

Preference Purpose

privacy.trackingprotection.content.protection.enabled Enables/disables the engine

privacy.trackingprotection.content.protection.test_list_urls Pipe-separated list of filter list URLs

This extension gives you a proper UI to manage both.

Features

🛡 One-click ETP toggle — Disable Firefox's built-in Enhanced Tracking Protection so adblock-rust handles blocking instead.…