Firefox Is Now the Last Major Browser Standing for Ad Blocking — Here's Why That Matters
If you care about ad blocking, your options just narrowed to one browser. A recent PCWorld report confirms that Firefox is now the last major browser that still fully supports uBlock Origin — the gold standard of content blockers. Chrome, Edge, and Safari have all moved to extension APIs that fundamentally break how uBlock Origin works.
What Happened?
The story starts with Manifest V3, Google's new extension API for Chrome. Google argued that the old extension API (Manifest V2) was too powerful and posed security risks. The new API restricts how extensions can intercept and block network requests — specifically, it removes the webRequest API that uBlock Origin relies on.
Google's alternative, the declarativeNetRequest API, forces extensions to declare their blocking rules upfront rather than dynamically intercepting requests. This is fundamentally less capable. uBlock Origin's maintainer, Raymond Hill, has been clear: uBlock Origin Lite (the Manifest V3-compatible version) is a significantly degraded experience.
Apple's Safari went through a similar transition years ago, and Microsoft's Edge follows Chrome's lead on extension APIs since it's Chromium-based. That leaves Firefox — powered by Mozilla's Gecko engine, not Chromium — as the sole holdout.
Why uBlock Origin Matters
uBlock Origin isn't just about blocking ads. It blocks:
- Trackers that follow you across the web
- Malvertising — malicious ads that can deliver malware without you clicking anything
- Coin miners that hijack your CPU to mine cryptocurrency
- Cookie consent banners and other dark patterns
- Bandwidth-werving scripts that slow down page loads
Studies have shown that uBlock Origin can reduce page load times by 40-60% on ad-heavy sites and significantly reduces data consumption on mobile. For users on metered connections or older hardware, this isn't a convenience — it's a necessity.
The Broader Pattern
This isn't just about ad blockers. It's part of a broader pattern where browser vendors are reducing user control:
- Chrome's Privacy Sandbox replaces third-party cookies with Google-controlled "Topics API" — keeping Google as the middleman
- Safari's ** Intelligent Tracking Prevention** has increasingly aggressive rules that break legitimate tools while not fully preventing Apple's own tracking
- Edge ships with Promotional tabs and shopping features that can't be fully disabled via extension APIs
When the browser controls what extensions can do, the browser vendor decides what the web looks like for you. Firefox, with its independent engine and Mozilla's nonprofit parent, is the only major browser where user control remains a design principle rather than a compromise.
What You Should Do
If you're not already on Firefox, now is the time to switch. Here's a quick setup guide:
- Install Firefox from mozilla.org
- Install uBlock Origin from addons.mozilla.org (not uBlock — the "Origin" part matters)
- Enable strict tracking protection in Settings > Privacy & Security
- Consider these companion extensions: Privacy Badger, Bitwarden (password manager), and Dark Reader
If you need a Chromium-based browser for compatibility testing, Brave offers built-in ad blocking that doesn't rely on the extension API, though it's not as configurable as uBlock Origin.
The Real Question
The web was built on the principle that the user controls their experience. When browser vendors decide that ad blocking is too powerful for users to have, they're making a value judgment about who the web belongs to. Firefox is the last browser that still answers: it belongs to you.
This article is based on a PCWorld report that reached the Hacker News front page with 366 points and 139 comments.
Top comments (0)