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Firefox 158 released with JPEG XL support by default

firefox.com32 points2 comments
Screenshot of Firefox 158 released with JPEG XL support by default

Firefox 158, released October 13, 2026, brings several user-facing enhancements and bug fixes. Form filling in Smart Window now suggests data from relevant open tabs and saved autofill info (rolled out progressively), saving/printing pages produces more accessible PDFs on Linux and macOS and resolves PDF rendering issues (including missing math symbols), and JPEG XL image support is enabled by default for better compression than WebP, JPEG, PNG, and GIF. New Tab now keeps a library of custom wallpapers under Your images, and translation support was added for Albanian, Belarusian, and Filipino. Notable fixes address favicons blending into highlights on Ubuntu, a crash when loading favicons, underlined letters causing shortcut conflicts in the Unified Search menu, menu color issues with Windows High Contrast themes, and various security fixes. Scrolling precision was improved by removing rounding to whole-screen pixels, benefiting high-resolution and zoomed pages.

Developer and platform updates include a Network Monitor fix for missed WebSocket messages, typed arithmetic support in CSS calc(), a navigate option for Notification constructors and ServiceWorkerRegistration.showNotification(), and broader WebAuthn conditional UI support for autocomplete="webauthn". PerformanceResourceTiming.deliveryType can now report cached resources, and the WebGL EXT_polygon_offset_clamp extension is available on compatible hardware. An unresolved issue affects web apps installed via the third‑party PWAsForFirefox tool - updating to version 2.20.1 or reinstalling the runtime is recommended. Enterprise users should consult the Enterprise Release Notes and admin changelog. The release also recognizes 20 first-time community contributors.

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