Zen Browser has released version 1.24.1b, which includes a critical security patch addressing a CVSS 8.8 vulnerability, coinciding with the impending shutdown of its competitor, Arc, on December 22. The update improves the browser's engine by upgrading to Firefox 159.0.1 and introduces a grain filter for theme customization while resolving several platform-related bugs. Users migrating from Arc can import their data into Zen, which offers a more open and customizable browsing experience without Google code, although it lacks support for licensed Widevine, blocking access to certain DRM streaming services. Despite its improvements, the small development team has no plans for mobile versions, focusing solely on desktop use

Zen Browser 1.24.1b Release Closes Security Hole as Arc Faces Sunset

Zen Browser 1.24.1b, released today, is a patch that bumps the engine to Firefox 159.0.1 and closes the CVSS 8.8 layout vulnerability CVE-2026-120572 just days after Mozilla's advisory. Beyond security, it adds grain options to the theme picker and fixes a batch of platform bugs, from Windows antivirus crashes to swapped WebGL colors on Linux. The timing lands as The Browser Company shuts down Arc on December 22, with Zen already offering Arc and Dia import to lure displaced users. The trade-offs remain: no licensed Widevine means blocked DRM streaming, and the small team has no mobile versions planned.

Zen Browser 1.24.1b Release Closes Security Hole as Arc Faces Sunset @ Linux Compatible