Firefox extension enables and manages Brave's adblock-rust engine silently shipped in Firefox 149
By
electricant
Crackling crust, pillowy middle. The kind of bagel that earns a second cup of coffee.
Summary
Firefox 149 silently shipped adblock-rust, Brave's open-source Rust-based ad and tracker blocking engine, disabled by default with no user interface or release notes. This article discusses a Firefox extension called adblock-rust-manager that enables and manages this built-in engine, providing a UI to control it. The engine supports network request blocking, cosmetic filtering, and uBlock Origin filter list syntax compatibility.
Key quotes
· 3 pulledIn 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.
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