Release notes for version 1.21.15b
By Steven Van ·
If you encounter any issues, please report them on the issues page. Thanks everyone for your feedback!
Zen Browser announced Release notes for version 1.21.15b on August 19, 2026.
What changed
If you encounter any issues, please report them on the issues page. Thanks everyone for your feedback! ❤️ ✓ Fixes Improved battery life on MacOS when using vibrancy effects Improved performance of session restore, having spikes of CPU usage every time the session is stored into disk (#14990) Fix multiple glance tabs when joining tabs (#14975) Improved rendering performance on MacOS and memory leaks when using WebRTC (#9649) Fixed an issue on macOS where closing a browser window could leave behind an invisible window that continued to capture mouse clicks over the area where it used to be. Fixed an issue on Windows where an auto-hiding taskbar would not appear until the Zen window had been minimized and restored after launch. Fixed an issue where the Windows taskbar would appear in front of a full screen Picture-in-Picture window. Fixed PDF documents not being scaled correctly in print preview when the Fit to Page Width option is used. Other bug fixes and improvements. ⭐ Features Update Firefox version to 154.0 Local Zen profile backups are now available on macOS in addition to Windows and Linux, and backups can be restored across all three platforms. Sites can now be exempted from