Zen Browser 1.17.4b has been released with significant improvements to its stability and functionality, based on the latest version of Firefox. The update addresses a critical security issue related to WebGPU vulnerabilities that could have allowed malicious actors to escape the sandboxed environment. New features include a 'Clear Tabs' button in the sidebar for quickly closing open unpinned tabs and an upgrade to Firefox 144.0.2 with various bug fixes and enhancements. This release also resolves several minor issues, such as performance problems on macOS and startup crashes on Windows.

Zen Browser 1.17.4b released

A new version of Zen Browser, an open-source web browser based on Firefox, has been released - Zen Browser 1.17.4b. This update brings significant improvements to the browser's stability and functionality.

This release addresses a critical security issue. Starting with Firefox version 142, it was discovered that compromised child processes could potentially exploit WebGPU-related IPC calls to trigger a use-after-free vulnerability within the GPU or browser process. The result could have allowed malicious actors to escape the confines of the sandboxed environment. Fortunately, the developers have identified and patched this issue.

In addition to security enhancements, Zen Browser 1.17.4b boasts several exciting new features. The most notable one is the introduction of a 'Clear Tabs' button in the sidebar. This feature enables users to quickly close all open unpinned tabs with just a click, streamlining their browsing experience.

As part of the update, the browser has also been upgraded to Firefox 144.0.2, which incorporates various bug fixes and enhancements from the parent project.

This release has resolved several minor issues, among them:

• A flickering sidebar issue that occurred when dragging links in compact mode has been fixed.
• The double toolbar URL bar permission icons are now properly centered vertically, improving the browser's aesthetics.
• Performance and video playback problems on macOS Tahoe under heavy system loads have been addressed, providing a smoother browsing experience for users with these configurations.

Lastly, the update fixes a startup crash issue that was affecting Windows users who had Avast or other security software installed. This change should provide a more stable launch experience for affected users.

Zen-browser/desktop Release Release build - 1.17.4b (2025-10-30)

Zen Stable Release Security Various security fixes New Features Updated to Firefox 144.0.2 Added a new 'Clear Tabs' button to the sidebar to quickly close all open unpinned tabs.

Release Release build - 1.17.4b (2025-10-30) · zen-browser/desktop