Zen Stable Release

Security

• https://www.mozilla.org/en-US/security/advisories/mfsa2026-68/

New Features

• Updated Firefox to 153.0
• High Dynamic Range (HDR) video playback is now available on Windows - this feature needs HDR mode enabled for the display in Windows Settings - Display.
• Improved UI for container selection and management
• It is now possible to merge multiple PDFs by dragging a PDF into the PDF sidebar.
• Added support for Apple's system-wide full-screen keyboard command (Globe-F).
• Zen now verifies and displays Qualified Website Authentication Certificates (QWACs) in accordance with eIDAS regulations.
• Added improved support for videos with overlays so users can more easily access video actions from context menus.

Fixes

• Fixed 'Add tab to essentials' context menu item being always disabled (#14616)
• Fixed external links not being routed properly by Space Routing (#14600)
• Fixed boosts size override not persisting (#14461)
• Other bug fixes and improvements.