How Mozilla says its iOS ad blocker works

Mozilla describes Firefox’s iOS ad blocker as an optional browser feature that targets intrusive advertising formats, advertising networks operated by third parties and trackers associated with ads. Because the blocker is integrated into Firefox, Mozilla says it does not require a separate extension. Its filtering uses EasyList together with Apple’s WebKit Content Blocker technology to determine what to block.

To enable it, Mozilla directs users to Firefox’s settings, then the browsing controls, where they can switch on the ad blocker. The scope is limited: Mozilla says some advertising remains visible, including ads delivered directly by host sites and those appearing in search results. Enabling the control therefore does not mean every advertisement will disappear.

Mozilla’s steps for summaries and tab groups

For page summaries, Mozilla describes two ways to activate Shake to Summarize: shake the phone while viewing a page containing fewer than 5,000 words, or select the page-summary command through the additional options in the three-dot menu. Mozilla lists availability on both iOS and Android in English, German, French, Spanish, Portuguese, Italian and Japanese. The stated page-length condition limits the scope of its shake-to-summarize instructions.

For organizing tabs, Mozilla says Android users can drag one tab onto another or select several tabs and choose the grouping command. A group receives a label and color and appears in the tab tray as one searchable card. Mozilla says users can open, rename, recolor or delete those cards. It directs users to the latest Android version of Firefox and describes iOS support as forthcoming.

What Mozilla says Firefox Sync carries between devices

Mozilla describes Firefox Sync as a way to access browser information when moving between a phone, tablet and laptop. The items it specifically identifies are open tabs, bookmarks and passwords. In Mozilla’s account, access to those items helps users return to browsing tasks across devices; those are the concrete categories of information described as available through the feature.

To start syncing, Mozilla instructs users to connect Firefox on an iOS or Android phone to their Mozilla account and sync with their other devices. Mozilla says Sync protects the transferred browser data with end-to-end encryption, with encryption occurring before the data arrives at its servers. The described setup links the phone to the account used for browsing across devices.

Sources & context

  1. Firefox mobile features for better productivity wherever you work | The Mozilla BlogMozilla

    Single-source report; claims attributed to the source, not independently verified. Source feed date (unspecified): 2026-09-21T17:00:00.000Z. Study date: not established. Consulted: 2026-09-30T17:00:03.834Z.

AI assisted with preparing and checking this article. The responsible editor accepted this version for publication following an assisted review of facts, sources and attribution.

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