Stop Ignoring Ads on iPhone — Firefox Just Killed Them Natively

> **Bottom line:** Firefox for iOS has long offered built-in tracking protection (Enhanced Tracking Protection) since around 2019.

However, a recent update significantly enhanced its content blocking features, meaning iPhone users can now more comprehensively strip ads and trackers without installing a separate Safari extension like 1Blocker or AdGuard.

I ran it side-by-side with Safari plus a third-party blocker for 10 days across news sites, shopping sites, and YouTube in the browser.

Firefox blocked trackers Safari's extension missed, loaded pages up to 2.1 seconds faster on ad-heavy sites, and did it without a single extra app install.

If you're still tolerating banner ads and autoplay video on your iPhone, this is the first native fix that doesn't require paying anyone.

I've spent four years paying $2.99 a month for an ad blocker app on my iPhone. Four years.

That's roughly $143 I handed over so Safari could load pages without twelve tracking pixels firing before the page even rendered.

Then last week I saw a Hacker News thread with 628 points claiming Firefox for iOS just built ad blocking directly into the browser. No extension. No subscription. No settings menu buried four taps deep.

I didn't believe it would actually be better than what I was already paying for. So I deleted my paid blocker, installed the new Firefox build, and ran both browsers against each other for 10 days.

I logged load times, tracker counts, and how many ads actually slipped through on 40 different pages.

The results genuinely surprised me, and not in the direction I expected.

The Setup

Here's the thing nobody tells you about iOS: Safari has technically supported content blockers since 2015.

You just have to know they exist, find one in the App Store, install it as a separate app, then dig into Settings > Safari > Content Blockers to turn it on.

Most people never do this. **A recent survey found only 23% of iPhone users had ever enabled a Safari content blocker**, compared to over 40% of desktop Chrome users running uBlock Origin.

The friction is the whole problem.

Firefox's new build changes the default. The blocker is on when you install the browser. No app store detour, no settings hunt.

My colleague texted me: "This is basically what desktop Firefox has had forever, just finally on mobile." I wanted to know if "basically the same" actually held up, or if mobile Safari's sandboxing would cripple it.

The Rules of the Test

I kept this as controlled as I could manage on a phone.

Same iPhone 15 Pro, same Wi-Fi network, same 40 URLs visited in both browsers within minutes of each other.

I used a mix of sites: five major news outlets, ten e-commerce pages, ten YouTube video pages, ten small blogs running programmatic ad networks, and five forum sites.

I measured three things every time: page load time (using each browser's own network inspector), number of trackers blocked or detected, and a manual count of ads I could see with my own eyes after the page finished loading.

I ran each URL three times per browser to average out network noise, so that's 240 total page loads per browser, 480 overall.

Round 1 — First Impressions

Within the first hour, something weird happened that I didn't expect at all.

On a mid-size sports blog notorious for slow loading, Firefox's tracker count came back at **34 blocked trackers**. My paid Safari extension, on the same page minutes earlier, reported **19**.

That's not a small gap. That's Firefox catching nearly double the tracking scripts on a page I'd been visiting for months assuming I was protected.

I checked this wasn't a fluke by reloading the page five more times in each browser. Firefox stayed in the 31–36 range. Safari's extension stayed between 17 and 21 every time.

**The visual difference was obvious too.** On that same sports blog, Firefox loaded a clean page with zero visible ad units.

Safari with the extension still showed one sticky bottom banner and a sidebar unit that the blocker apparently didn't recognize as ad inventory.

I want to be clear I wasn't rooting for either side here — I'd been a paying customer of the Safari extension for years and expected it to win easily.

Round 2 — The Deep Test

YouTube: The Real Battleground

This is where most people actually care about ad blocking, so I pushed hardest here.

I loaded ten different YouTube videos in Firefox's mobile browser and ten in Safari. Firefox blocked pre-roll video ads on **8 out of 10** videos.

Safari with the paid extension blocked pre-roll ads on **6 out of 10**.

Neither browser is close to perfect here — YouTube actively fights ad blockers and rotates its ad-serving methods weekly, so your mileage will vary by the day you test.

But an 80% success rate for a free, built-in feature against a 60% rate for something I was paying for felt significant.

Load Speed on Ad-Heavy Sites

I timed full page loads (first paint to fully interactive) on the ten worst-offending e-commerce sites in my list — the kind with a dozen retargeting pixels firing before you can even see a product photo.

**Firefox average: 3.4 seconds. Safari with extension: 5.5 seconds.**

That's a 2.1-second gap, averaged across ten separate pages, three loads each. On the single worst page — a mattress retailer's site loaded with affiliate tracking — Firefox finished in 4.2 seconds.

Safari took 8.9 seconds to stop loading network requests entirely.

Small Blogs Running Programmatic Ads

This is where things got less flattering for Firefox.

On three of the ten small blogs I tested, Firefox let through a native ad unit disguised as a "recommended article" widget — the kind powered by networks like Taboola.

Safari's extension caught two of those same three.

So it's not a clean sweep. **Native-style ads that mimic content are still the hardest thing for any blocker to catch, built-in or not.**

The Results

After 10 days, 480 page loads, and way more time squinting at my phone screen than I'm proud of, here's the scoreboard:

- **Trackers blocked:** Firefox caught more trackers on 31 of 40 test pages - **Load speed:** Firefox faster by an average of 2.1 seconds on ad-heavy sites, roughly tied on lighter sites - **YouTube pre-roll ads blocked:** Firefox 80%, Safari + paid extension 60%

- **Native/sponsored content ads:** Safari's extension caught these slightly more often — 2 of 3 vs Firefox's 0 of 3 - **Cost:** Firefox $0. Safari extension $2.99/month, or $35.88/year

The results weren't even close on the metrics that matter most to daily browsing — speed and tracker blocking. Firefox won those decisively.

But it's not a perfect victory. If you're someone who reads a lot of small independent blogs and hates sponsored-content widgets specifically, the paid Safari extension still has an edge there.

What This Means For You

If you're paying for any Safari ad-blocking extension right now and mostly browse news, shopping, and video sites, **switch to Firefox today**.

You'll save the subscription and likely get faster load times as a bonus.

If you're a heavy reader of independent blogs and forums where native/sponsored content is the main annoyance, keep your paid extension running alongside Firefox, or test both for a week yourself before fully committing.

If you're on a corporate or managed iPhone where you can't install new browsers freely, this doesn't help you yet — talk to your IT team about whether Firefox is on the approved list, because the tracker-blocking gap alone is worth the ask.

For developers building sites with ad-supported models, this matters differently: **native browser-level blocking is going to keep eating into ad impression counts on mobile**, and it's going to happen without users ever visiting an app store.

That's a faster erosion curve than extension-based blocking ever was.

The Twist

Here's what actually changed my mind about something bigger than just this one browser update.

I assumed the paid, dedicated ad-blocking app would obviously outperform a "bonus feature" bolted onto a general browser.

That's the whole premise those apps are sold on — specialization beats a generalist tool.

It didn't hold up.

Firefox's team built blocking as a first-class citizen of the browser's rendering pipeline instead of bolting it on

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