---
title: "Firefox Has Quietly Integrated Brave's Adblock Engine"
url: https://daily.dev/posts/firefox-has-quietly-integrated-brave-s-adblock-engine-icdbdfmgl
source_url: https://feed.itsfoss.com/link/24361/17324714/firefox-ships-brave-adblock-engine
type: article
source: "It's Foss"
published: 2026-04-24T11:16:59.939Z
updated: 2026-04-24T11:17:34.267Z
tags: ["rust", "firefox"]
reading_time: 3
upvotes: 206
comments: 35
language: en
---

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# Firefox Has Quietly Integrated Brave's Adblock Engine

**[It's Foss](https://daily.dev/sources/itsfoss)** · 3 min read · 206 upvotes · 35 comments

## Summary

Firefox 149 quietly shipped adblock-rust, Brave's open-source Rust-based ad and tracker blocking engine, without mentioning it in the release notes. The integration was filed as a Bugzilla bug titled 'Add a prototype rich content blocking engine' and is currently disabled by default with no UI or filter lists. The engine supports uBlock Origin-compatible filter list syntax and handles network request blocking and cosmetic filtering. Waterfox, a Firefox fork, has also adopted the same implementation. A step-by-step guide is provided to enable and test the feature via about:config using EasyList and EasyPrivacy filter lists.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://feed.itsfoss.com/link/24361/17324714/firefox-ships-brave-adblock-engine>

## Community discussion

Top comments from developers on daily.dev.

**@randy** · 26 upvotes

> I'm sure there's a term for this. Something like "dark shipping." Off by default, test in prod... A little surprised that users can see it and possibly turn it on, but I'm not going to judge.

**@cypheroxide** · 25 upvotes

> It's almost like Brave is better for content consumption. I understand the point of getting off the Chromium base, I used Firefox and its forks for years. Unfortunately, Mozilla has broken my trust with several of their decisions, and I moved on.
>
> Yeah, I use Brave as a daily driver browser, but I'm looking for a non-Chromium and non-Firefox based browser. And don't `@` me if the suggestion is OperaGX. I **will** block you. ;)

**@petermrozek** · 22 upvotes

> Baking an ad blocker in? I must say, this was a... brave decision. I'll show myself out... 😄

**@renehoehle** · 19 upvotes

> Good for the user not so good for the ads business.

**@webry** · 17 upvotes

> yea idk, my pi doesnt trust you mr firefox
>
> ![image.png](https://media.daily.dev/image/upload/s--1hJAIZrS--/f_auto/v1777044790/ugc/content_23cf37bb-7f02-4b05-8162-745c887f3f7d?_a=BAMAMiWQ0)

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---

Tags: [#rust](https://daily.dev/tags/rust), [#firefox](https://daily.dev/tags/firefox)

[View this post on daily.dev](https://daily.dev/posts/firefox-has-quietly-integrated-brave-s-adblock-engine-icdbdfmgl)