Mozilla has implemented an integrated ad blocker in Firefox for iPhone devices. This addition allows users to reduce exposure to intrusive advertising, such as overlays and pop-ups, without needing external software.
The blocking mechanism operates directly at the network level, utilizing a filter list based on the well-known EasyList. This functionality prevents third-party tracking and advertising ecosystems from loading even before the page is fully rendered.
Currently, this feature is disabled in jLS. To activate it, users must navigate to the browser Settings, scroll to the 'Navigation' section, and then select the ad blocker option within the 'Content' submenu.
It is possible to monitor the tool's operation in real time through the page menu while browsing. The interface provides visual indicators to confirm the protection status; when active, the tab displays small green shield icons. The developer itself advises temporarily disabling the feature if any website exhibits formatting or loading errors.
Although the blocker is effective against trackers and invasive ads, it has pre-programmed exceptions. Specifically, it does not hide ads present on search engine results pages, including platforms like Google, Bing, and DuckDuckGo. Furthermore, sponsored content displayed on the Firefox homepage and in new tabs remains visible, as it is a direct revenue source for Mozilla.
The decision not to interfere with search results is directly linked to the company's business model. Data projected for 2025 indicates that 90% of revenue comes from the browser, with approximately 85% of that amount generated by an agreement that kept Google as the default search engine.
In addition to intentional exclusions to preserve partnerships, Mozilla warns that some more sophisticated advertising technologies can still bypass the current filter list, preventing complete blocking.