Mozilla ships built-in ad blocking for Firefox on iOS

Mozilla has officially shipped a built-in ad blocker for Firefox on iOS, closing a gap that had left the browser behind competitors on Apple's mobile platform. According to The Verge, the feature has graduated from a testing period that ran over the past few weeks and is now rolling out to users.

The new option blocks most third-party ads and trackers before they load on an iPhone, which The Verge reports reduces bandwidth consumption and cuts down on the clutter that often overwhelms mobile websites.

Built on Apple's content blocker tech

The Verge says Mozilla implemented the feature using Apple's WebKit Content Blocker technology paired with the EasyList filter, a long-standing community-maintained blocklist used widely across ad-blocking tools. Because the blocker is part of the browser itself, iOS users no longer need to download and install a separate extension to get ad filtering working — a meaningful simplification on a platform where extension support has historically been limited.

Off by default

Mozilla is shipping the blocker in a disabled state. Turning it on requires a trip into the browser's preferences: Settings, then Browsing, then Ad blocker. For more granular control, The Verge notes there is also an option in the site menu that lets users toggle blocking on or off during a browsing session.

What still gets through

The blocking is not comprehensive. According to The Verge, ads served directly by the website being visited will still appear, as will ads shown in search results. Sponsored shortcuts and other sponsored content that Firefox itself displays when a new tab is opened are also exempt — a limitation the report characterises as unsurprising.

A late arrival on iOS

This is the first time Firefox has offered ad blocking support on iOS, but the capability is far from novel in the wider mobile browser market. Brave, Vivaldi, Opera and other rival browsers already ship built-in ad blockers on the platform, according to The Verge, which made Firefox something of an outlier among alternative browsers on iOS.

Why it matters

Firefox on iOS has been one of the few prominent alternative browsers without native ad blocking, and this release removes that competitive disadvantage at a time when users increasingly expect blocking to come standard. The implementation choices matter as much as the launch itself, though. Because the blocker is disabled by default, its real-world impact depends on users discovering a setting buried in the preferences rather than on Mozilla pushing it broadly. The carve-outs are also notable: first-party ads, search ads and Mozilla's own sponsored placements all survive, so the feature is best understood as third-party ad and tracker filtering rather than comprehensive ad blocking. Still, for iPhone users who want lighter, faster-loading pages without managing extensions, it is a practical upgrade — and a sign that Mozilla is willing to lean on Apple's native tooling to match features its rivals have offered for years.