Zen Browser has released version 1.23.1b as a security patch on October 6, which builds on Firefox 157.0.1 and addresses various bugs and improvements. The update includes enhancements to the Library panel, such as a closed-tab filter and a quick-open shortcut, while also fixing macOS issues related to sidebar opacity and download prompts. The primary reason for this release is to close security vulnerabilities highlighted in Mozilla's advisory MFSA2026-104. Zen Browser is gaining traction as a Firefox-based alternative, offering unique features and improvements that cater to users seeking productivity without the constraints of a corporate roadmap

Zen Browser 1.23.1b Releases as Security Patch on Firefox 157.0.1

Zen Browser just pushed 1.23.1b to its stable channel on Oct. 6, delivering a security patch rather than a feature drop. The update rides Firefox 157.0.1, addresses advisory MFSA2026-104 and CVE-2026-106016, and tidies up the Library panel with a closed-tab filter and quick-open shortcut. It also repairs a couple of macOS and sidebar-opacity bugs while pulling users onto Mozilla's latest fixes. As the go-to Firefox fork for Arc-style productivity, the build keeps the project on current security without adding much beyond what 1.23 already shipped.

Zen Browser 1.23.1b Releases as Security Patch on Firefox 157.0.1 @ Linux Compatible