Mozilla tests native ad blocking for Firefox on iOS

Mozilla has launched an optional, experimental built-in ad blocker for Firefox on iOS to improve user privacy and browsing speed. The feature is currently being deployed via a progressive rollout, meaning it will become available to users in stages rather than all at once.

The new tool is disabled by default, requiring users to manually enable it via a toggle within the app settings. Once active, the blocker targets third-party advertising networks, trackers, and pop-ups. To achieve this, Mozilla is utilizing a filter list based on EasyList, which allows the browser to identify and block advertisements before they load on the page. However, Mozilla noted in its FAQs that while the browser blocks many third-party ads and advertising infrastructure, "not every advertisement can be blocked."

The iOS Constraint

Implementing native ad blocking on iOS has historically been a challenge for third-party browser developers. Apple requires all browsers on the platform to use the WebKit engine, a restriction that limits the ability of developers to implement the same deep-level blocking capabilities found in desktop versions of Firefox or its Android counterpart. While some competitors, such as Brave, have integrated their own privacy services to circumvent these hurdles, Mozilla's introduction of a native solution marks a significant shift in its iOS strategy.

Privacy vs. Revenue

Despite the new capabilities, the ad blocker is not comprehensive. Mozilla has confirmed that the tool does not block advertisements appearing in search results from providers like Google or Bing. This limitation underscores a persistent tension in the browser market: the balance between enhancing the user experience and maintaining the financial partnerships that sustain browser development. For a non-profit organization like Mozilla, the exclusion of search ads highlights the complexity of providing privacy tools while relying on search-engine revenue streams.

What to Watch

As the progressive rollout continues, users should check their settings to see if the experimental toggle has appeared. Because the feature is labeled as experimental, Mozilla may adjust the filter lists or the scope of the blocking based on user feedback and performance data. It remains to be seen if Mozilla will expand the blocker's capabilities to include more types of sponsored content or if the current limitations will remain a permanent fixture of the iOS experience.