Mozilla Automation TeamSema Karaman3 min readintermediate
Browsers compete on privacy. When the operating system allows.
Summary
Firefox adds a built‑in EasyList ad blocker for iOS using WebKit’s Content Blocker API, highlighting how Apple’s app‑store and engine restrictions limit independent browsers from offering full add‑on ecosystems, and arguing that true competition requires platform‑level policy change.
- Apple’s App Store rules and mandatory use of WebKit prevent Firefox (and other browsers) from supporting the same add‑on ecosystem on iOS as on desktop/Android.
- Firefox’s new iOS ad blocker is an EasyList‑based filter implemented via WebKit’s Content Blocker framework and is off by default.
- Around 40 % of Firefox desktop/Android users rely on add‑ons for privacy, accessibility, and password management.
- Platform‑level restrictions raise development costs, slow innovation, and create inconsistent user experiences across devices.
When a dominant mobile OS controls both the distribution channel and the browser engine, it can dictate which privacy tools are available to users, effectively limiting competition and user choice. Firefox’s ad‑blocker is a stop‑gap that underscores the need for regulatory or platform changes to al…
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