Mozilla Adds Built-In Ad Blocker to Firefox Browser on iOS Devices

For years, Firefox has promoted privacy and user control as core features, but its iOS version lacked a built-in ad blocker. Users who wanted to block ads and trackers on iPhones had to rely on third-party extensions or switch to browsers that offered integrated options.

Meanwhile, Apple's restrictions on browser engines and extension support limited what Firefox could offer on iOS. This changed in March 2026, when Apple opened its browser engine to rivals, according to The Next Web. The move allowed browsers like Firefox to use Apple's WebKit Content Blocker technology, paving the way for more advanced features.

In the weeks leading up to September 2026, Mozilla quietly tested ad blocking for Firefox on iOS. The Verge reported that on September 1, Mozilla officially launched the feature, making it available to all iPhone users.

The new ad blocker uses Apple's WebKit Content Blocker system and the widely used EasyList filter to block most third-party ads and ad trackers before they load. MacRumors and Techmeme noted that this brings Firefox for iOS closer to the privacy tools found in its desktop and Android versions.

Digital Trends pointed out that the ad blocker is switched off by default. Users must turn it on in the browser's settings to start blocking ads. The Next Web confirmed that the technology is built on Apple's WebKit API and leverages the EasyList filter.

According to The Register, while third-party ads are blocked, users may still see ads on Mozilla's own pages, including the new tab page. Several outlets, including GBHackers On Security and Cyber Security News, emphasized that this update means iPhone users no longer need to install separate extensions to block ads and trackers.

Mozilla's built-in ad blocker for Firefox on iOS is now available to all users, but it is not enabled by default. Anyone who wants the extra privacy and less clutter needs to activate it manually in the app's settings.

The feature blocks most third-party ads and trackers, but some ads, especially those on Mozilla's own pages, may still appear. This addition brings Firefox for iOS closer to its competitors and aligns with Mozilla's reputation for privacy-focused browsing.