SNACK Summary in 3 Lines
- Optional ad blocking is now built directly into Firefox for iOS
- Off by default; enable it at Settings > Browsing > Ad Blocker
- Blocks many third-party ads, while site-served and search ads may remain
Snackgirls react
AIKO — A built-in blocker whose switch starts in the off position: even automation has an onboarding step. At least the control sits inside the browser instead of another extension.
Nea — I appreciate Mozilla stating the boundary plainly. Knowing that site-served and search ads may remain makes the feature easier to understand before enabling it.
Firefox for iOS now includes an optional built-in ad blocker, but it is switched off by default and does not remove every ad. Once enabled, it can stop many third-party ads and ad-related trackers before they load without requiring a separate extension.
One switch inside Firefox
The feature can be enabled under Settings > Browsing > Ad Blocker. Mozilla built it directly into the iOS browser because extensions are not available there in the same way they are on desktop and Android Firefox.
How the blocking works
Ad Blocker uses Apple WebKit Content Blocker technology with the EasyList filter list to catch many third-party ads and related trackers before they load.
It works alongside Enhanced Tracking Protection rather than replacing it. That separate Firefox protection blocks many trackers and limits cross-site tracking.
Why some ads can still appear
Ads served directly by the site being visited and ads displayed in search results may remain visible. Firefox sponsored shortcuts and other sponsored content on the new-tab page are also separate from Ad Blocker and are not affected by the switch.
Mozilla asks users to report unexpectedly visible ads or sites that behave strangely through Mozilla Connect.
Sources and checked date: Mozilla Blog · Mozilla Support · Apple App Store · September 6, 2026
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