Mozilla’s planning to give Firefox an ad blocker
Firefox is set to get its own ad blocker. In future, users won’t have to bend over backwards to fend off ads and tracking attempts.
Mozilla is working on integrating a native ad blocker into Firefox. Ajit Varma, the company’s Head of Firefox, confirmed in an interview that the feature would be built into the browser itself. Although he didn’t mention a specific release date, he was clear about the direction of the project. In future, Firefox will offer more built-in protection against intrusive ads and tracking attempts.
This isn’t a surprising move. For years now, ad blockers have ranked high on users’ most-used extensions. But they’re more than just tech gimmickry. Now that banners, pop-ups, autoplay videos, cookie consent screens and tracking scripts have become part and parcel of internet browsing, many users find surfing the net to be a hassle without an ad blocker. Rather than leaving ad-blocking solely to third-party extensions, Mozilla plans to build the feature into the browser itself.
Mozilla’s going for an in-house solution over third-party tech
There’s been chatter surrounding Mozilla’s ad blocker project for some time now. Indications that the company had been experimenting with technology developed by Brave – a browser that’s had a built-in ad blocker for years – had appeared in the source code. In his interview, however, Varma stressed that these were just internal tests.
As far as we know, Mozilla will be developing its own implementation solution rather than relying on a third-party engine. Its experiments with Brave technology have mostly been about exploring anti-tracking measures.
Mozilla’s deliberately taking matters into its own hands. Instead of adopting or licensing an existing solution, the company’s investing in its own implementation. However, it’s still unclear what that’ll look like from a technical standpoint. Mozilla hasn’t revealed any detailed information, such as which filter lists it’ll use, how deeply the blocker will be integrated into systems or what options users will have.
Google changed the game
Mozilla’s decision is made all the more momentous by Google’s stance on ad blockers. With Manifest V3, Google changed Chrome’s extension architecture. Officially, this was supposed to provide greater security, better performance and a more up-to-date extension model. On the flipside, it put new constraints on ad blockers.
These constraints are especially apparent with uBlock Origin. The full-featured extension no longer provides the same capabilities in Chrome. Instead, only a functionally limited lite version is available. This is because changes to the interfaces have stopped extensions from blocking network requests to the same extent.
Firefox didn’t go down the same road. Mozilla held onto the powerful webRequest API, which allows traditional ad blockers to function effectively. This is consistent with the company’s notion of Firefox as a privacy-friendly alternative to Google’s ecosystem.
What will change for users?
For many people, the main impact of a built-in ad blocker would likely be less hassle. Users who haven’t installed an extension yet might get better protection against ads, tracking and data trading (link in German) as a direct consequence of the built-in blocker. This’ll make switching to Firefox significantly easier.
For seasoned users, however, there’s still an important unanswered question: can Mozilla’s own ad blocker compete with specialist extensions such as uBlock Origin or AdGuard? These solutions are flexible, powerful and maintained by active communities. We won’t know if Firefox is offering a genuine alternative to these extensions or just a basic solution until after its ad blocker’s release.
A strategically important step
Firefox has been under pressure for years. According to figures from StatCounter, the browser’s global desktop market share stood at 3.81 per cent in May 2026. Chrome clearly dominates the market with a 74.93 per cent share, followed by Microsoft Edge with 9.94 per cent and Safari with 5.32 per cent. Other analytics services arrive at different figures depending on their sources, but they all confirm the same basic finding: Chrome rules the roost, with Firefox struggling to maintain its visibility and relevance.
Source: Primakov/Shutterstock
Against this backdrop, the ad blocker Mozilla’s planning is more than just an extra convenience feature. It’ll give Firefox a clear USP in a market where competing on reach alone is virtually impossible. Chrome can’t really offer a comparable feature without affecting its own advertising business. And since Edge is based on Chromium too, it operates in the same technical environment. Firefox, on the other hand, remains one of the few major browsers with its own technical foundation.
This independence is Mozilla’s greatest strength. It allows the company to make decisions that don’t necessarily align with the interests of Google or the Chromium project.
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