Firefox 159 Adds Security Fixes and Animations
The update drops support for older operating systems and introduces new AI-powered page monitoring tools.
Updated on Oct. 29, 2026 in Cybersecurity
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Mozilla has released Firefox 159, which introduces support for scroll-driven animations and addresses 167 security vulnerabilities. The update also integrates the Qwen AI model for page monitoring and shares form-filling data with Gemini 3.1 Flash Lite.
Why it matters
This release follows a shift in how browser makers publish advisories by tracking memory safety issues individually rather than bundling them. Additionally, the new animation capabilities aim to ensure cross-browser compatibility for web developers.
Firefox 159 includes 167 security fixes, comprising 108 high-rated and 52 moderate-rated vulnerabilities. The release also implements support for scroll-driven animations, allowing CSS and Web Animations API progress to track with element visibility.
The players
Mozilla
The open-source organization behind the Firefox web browser and Gecko rendering engine.
The details
Scroll-driven animations allow web developers to link CSS animations and the Web Animations API—a tool for creating dynamic transitions on web pages—directly to a user's scroll position. For page monitoring, users can trigger the Qwen AI model by typing /watch into the browser's Smart Window. Form filling now transmits data to the Gemini 3.1 Flash Lite model, and users can manage a maximum of 15 simultaneous monitoring tasks which automatically pause after 60 days.
Timeline
October 27, 2026: Mozilla releases Firefox 159.
November 10, 2026: Firefox 160 is scheduled for release.
November 24, 2026: Firefox 161 is scheduled for release.
The Tech Race
Mozilla is aligning its security reporting with a broader industry trend of de-bundling memory safety advisories to provide more granular detail. This update also keeps Firefox competitive with other engines by standardizing support for scroll-driven animations.
Users on older operating systems, specifically Windows 8.1 and macOS 10.14 or earlier, will no longer receive support for this or future versions. Those on updated systems can utilize the new AI-driven page monitoring and form-filling features immediately via the Smart Window.
The takeaway
Users should update immediately to gain the 167 security patches provided in this version. Watch for the next milestone on November 10, 2026, when the company will release Firefox 160.
What happens next
Mozilla is scheduled to release Firefox 160 on November 10, 2026, followed by Firefox 161 on November 24, 2026.
Further reading
For broader trends in browser security and standards, see Cybersecurity.
Source note: This article includes information reported by NEWS WIRE.
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