Release build - 1.21.4b (2026-06-25)

Zen Stable Release

New Features

• Updated to Firefox 152.0.2 and 152.0.3
• Added 'Edit pinned tab' context menu item to manually set a pinned tab's URL
• Added 'Add Route for Domain' context menu item to quickly add a tab's domain to the Space Routing settings

Fixes

• Prevent sidebar from flickering when moving a tab (#14131)
• Full-screening while on a glance tab will now expand the glance tab to a normal tab (#11766)
• Fixed space routing tabs opening in background when it should be in foreground (#14183)
• Other minor bug fixes and improvements.