Zen Browser 1.22.2b has been released, upgrading its engine to Firefox 156 and incorporating Mozilla's MFSA2026-90 security patch, which addresses 67 CVEs of varying severities. The update includes new features such as macOS auto-start on boot and additional command-bar actions, while also resolving common issues like Picture-in-Picture subtitle bugs and cross-device sync problems. Performance improvements have been made, including a 45% faster loading time for the built-in PDF viewer and optimizations for Windows ARM64 users. As an open-source browser built on Firefox's codebase, Zen offers users rapid security updates and useful features without the hassle of manual patch management

Zen Browser 1.22.2b Ships with Firefox 156, Locking Down 67 CVEs

Zen Browser 1.22.2b is a new stable release that upgrades its engine to Firefox 156, inheriting Mozilla's MFSA2026-90 security patch that fixes 67 CVEs across high, moderate, and low severity. It adds practical touches like macOS auto-start on boot and five new command-bar actions for faster tab management. The build also tackles day-to-day annoyances, from Picture-in-Picture subtitles and Split View bugs to broken cross-device sync and a Windows taskbar that wouldn't auto-hide. Zen's built-in PDF viewer reportedly loads 45% faster, and open-source users benefit from riding Firefox's engine for rapid, reliable security updates.

Zen Browser 1.22.2b Ships with Firefox 156, Locking Down 67 CVEs @ Linux Compatible