Zen Browser 1.12.9b incorporates fixes, security enhancements, and modifications for Firefox versions 139.0 and 139.0.1. The update features automatic mod updates, enhanced performance for rendering rounded corners in webviews, and prioritization of critical processes during memory pressure on macOS. Improvements encompass the accurate restoration of icons for pinned and essential tabs, resolution of split view and Glance issues, and the proper operation of compact mode following window closure.
Zen Browser Release build - 1.12.9b (2025-05-30)
Zen Stable Release
This update includes several fixes, security updates, and a few changes! We've bundled the updates for Firefox 139.0 and 139.0.1 into the same release. Since Firefox 139.0 had some rendering issues on Windows for NVIDIA users, we waited an extra day to release this update to ensure the issues were resolved.
New Features
- Updated to Firefox 139.0 and 139.0.1
- Added automatic updates for mods
- Auto tab unloader now uses Firefox's default tab discarding feature, which is based on time and memory usage, instead of the previous time-only method
- Improved performance for rendering rounded corners in the webview
- Enabled the browser to prioritize more important processes when Zen is under memory pressure on macOS
- The context menu item 'Search text on search engine' now opens Glance instead of a new tab
Fixes
- Pinned and essential tabs not restoring their icons correctly
- Other issues with split views and Glance
- Compact mode should now work correctly after closing the window β please let us know if you still experience issues
