# Mozilla and uBlock Origin ad-blocking developments

> Live situation record from CLSTR: https://clstr.news/situations/mozilla-and-ublock-origin-ad-blocking-developments
> Updated: 2026-08-18T01:35:02.000Z. Sources: 12. Developments: 3.

The landscape of ad-blocking technology is shifting as developers and browser manufacturers adjust to technical challenges and market changes. The uBlock Origin team announced it would cease active maintenance of filters specifically for Facebook, citing the difficulty of countering Facebook’s methods to evade pattern matching, such as breaking up the “Sponsored” label into non-visible elements.

Maintainers noted that Facebook developers frequently implement countermeasures that render fixes obsolete within hours, often by altering element names or serving ads through first-party infrastructure. Experts suggest this retreat carries security implications, as ad blockers play a critical role in preventing users from encountering malicious or scam advertisements that impersonate trusted brands or promote fraudulent websites. While services like AdGuard may still provide coverage, uBlock Origin will no longer prioritize updates for Facebook’s evolving delivery methods.

Concurrently, Mozilla has begun rolling out an experimental native ad blocker for Firefox on iOS. This feature uses a network-level filtering system based on EasyList to target third-party advertising networks, trackers, pop-ups, and intrusive video overlays. While the tool aims to improve the browsing experience on iPhone and iPad, it is not designed to block all advertisements; sponsored links in search engine results and content on Firefox Home or New Tab pages will remain visible. Mozilla is deploying the update in stages to refine compatibility across different website technologies.

## Timeline

### 2026-08-18: uBlock Origin ceases active maintenance of Facebook ad filters

uBlock Origin is ceasing active maintenance of Facebook ad filters, citing the platform's constant efforts to bypass blockers, which also raises concerns regarding user exposure to scam ads.

2 sources. https://clstr.news/cluster/ublock-origin-ceases-active-maintenance-of-facebook-ad-filters

### 2026-08-16: Mozilla introduces native ad blocker for Firefox on iOS

Mozilla is introducing an experimental native ad blocker for Firefox on iOS, using EasyList to filter third-party ads, pop-ups, and trackers directly within the browser.

9 sources. https://clstr.news/cluster/mozilla-introduces-native-ad-blocker-for-firefox-on-ios

### 2026-08-11: uBlock Origin ceases Facebook filter maintenance as Mozilla adds iOS ad-blocking

uBlock Origin will cease active maintenance of Facebook filters due to technical evasion tactics, while Mozilla introduces native ad-blocking for Firefox on iOS to bolster user privacy.

2 sources. https://clstr.news/cluster/ublock-origin-ceases-facebook-filter-maintenance-as-mozilla-adds-ios-ad-blocking

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Cite as: Mozilla and uBlock Origin ad-blocking developments. CLSTR, https://clstr.news/situations/mozilla-and-ublock-origin-ad-blocking-developments