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Firefox iOS ad blocker 2026: WebKit EasyList, off by default

Mozilla added an opt-in blocker inside Firefox on iPhone. Below: the checkable launch note, the toggle path, and the ads it will not touch.

On 1 September 2026 Mozilla wrote that Firefox for iOS now includes a built-in ad blocker that can stop many third-party ads and ad-related trackers before they load.

The searchable story is the Firefox iOS ad blocker: WebKit Content Blocker plus EasyList, with no extra extension. The Verge and MacRumors followed the same day.

Weeks of testing 1 Sep: official launch Off until you flip it

What the official note said

The blog said screen space is scarce and pop-ups, overlays, and ads fill it fast. The built-in option blocks many third-party ads and ad-related trackers before they load. There is no separate extension. It is off by default, so you decide whether to use it.

1 Sep
Mozilla posted the iOS blocker
EasyList
Filter list in use
Off default
Settings → Browsing → Ad Blocker

How to turn it on, and what it skips

  1. 1

    Open it in Settings

    Path: Settings → Browsing → Ad Blocker. MacRumors said this is the same WebKit content-blocker API Safari blockers use; App Store blockers only apply to Safari, so Mozilla built the feature into Firefox.

  2. 2

    Toggle it from the site menu in a session

    The Verge: you can also switch it from the site menu while browsing. That menu shows whether blocking is on or off.

  3. 3

    Three classes it will not block

    First-party ads from the site you are on, ads in search results, and sponsored shortcuts or sponsored content on Firefox’s new tab. The blog treats that last group as separate from page ads.

01

It stacks with Enhanced Tracking Protection

Mozilla said Ad Blocker works alongside existing Firefox privacy protections, including Enhanced Tracking Protection. Do not read it as replacing that layer.

02

The desktop extension world stays

The blog said desktop and Android still support ad-blocking and privacy extensions. This ship fills the iOS gap.

03

Not the first built-in blocker on iOS

The Verge: Brave, Vivaldi, Opera, and others already offer built-in blockers on iOS. This is Firefox’s first time with that capability there.

Claim Checkable source How to read it
Built-in blocker, WebKit + EasyList, no extension Mozilla blog, 1 Sep 2026 Official product note
Off by default; Settings → Browsing → Ad Blocker Same post; The Verge, MacRumors You must turn it on
Skips first-party, search, and new-tab sponsored Mozilla blog Narrower than “no ads anywhere”

Blocking ads in a phone browser is not the same job as talking over a board in a tab. If you only need voice and a whiteboard, the wbroom homepage opens a room without an account. Mobile-browser notes: mobile browser. Create and join: create and join a room. Side-panel agent browser news: Claude Cowork built-in browser.

Mozilla, 1 September 2026: Ad Blocker is optional — you decide whether it is part of how you browse. Advertising funds much of the open web; ads can also crowd the screen.

# Firefox Ad Blocker on iOS (Mozilla, 2026-09-01)
Engine: Apple WebKit Content Blocker + EasyList
Where: Settings > Browsing > Ad Blocker (off by default)
Also: site menu toggle during a session
Does not block: first-party ads, search ads, Firefox new-tab sponsored content
Alongside: Enhanced Tracking Protection
Desktop/Android: still extension ecosystem
Rivals on iOS: Brave, Vivaldi, Opera already had built-in blockers
Coverage: The Verge, MacRumors, 2026-09-01

Boundaries

“No extension” means iOS, not desktop
Extensions work differently on iOS. Desktop and Android still install them. Do not read this as Firefox desktop dropping add-ons.
A rollout, not one global second
gHacks on 19 August said the experimental toggle had not reached everyone. 1 September is the official launch day. Update the app if the option is missing.
Ads outside EasyList can still show
gHacks and support notes say filters that EasyList does not list may still appear. The blocker only runs inside the Firefox iOS app.

Questions worth checking

Is this a Safari content-blocker extension?

No. MacRumors said App Store content blockers only work with Safari. Firefox uses the same WebKit Content Blocker API, but the implementation lives in its own app.

Will search ads vanish once it is on?

No. Mozilla said ads in search results and ads served by the site itself still appear. New-tab sponsored content is also out of scope.

Is Firefox first among Brave and Opera on iOS?

The Verge said no. Those browsers already ship built-in blockers on iOS. This story is Firefox adding the same class of switch.

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