Zen Browser Release Notes

Release notes for version 1.21.13b

Fri, 07 Aug 2026 00:00:00 GMT

If you encounter any issues, please report them on the issues page. Thanks everyone for your feedback! ❤️

✓ Fixes

Fixed infinite media players appearing infinitely in the sidebar when a page has multiple media players.
Other bug fixes and improvements.

⭐ Features

Release notes for version 1.21.12b

Fri, 07 Aug 2026 00:00:00 GMT

If you encounter any issues, please report them on the issues page. Thanks everyone for your feedback! ❤️

✓ Fixes

Fixed selecting text at the top of a page making the window drag instead of selecting text.
Other bug fixes and improvements.

⭐ Features

Release notes for version 1.21.11b

Wed, 05 Aug 2026 00:00:00 GMT

If you encounter any issues, please report them on the issues page. Thanks everyone for your feedback! ❤️

✓ Fixes

Fixes issue setting keybinds with shift + digit or symbol (#9918)
Fix closing split tab in one window changing focus of other windows (#13761)
Fixed audio and video failing to play, or hanging when seeking, on websites that load media from a Blob URL.
Other bug fixes and improvements.

⭐ Features

Updated Firefox to 153.0.3
You can now filter draft GitHub pull requests in live folders.
Compact mode now tracks your mouse even after it leaves the window, the sidebar stays open while your cursor lingers near the window's edge and only tucks away once you move further out. This only changed for Windows and MacOS, Linux is still the same as before.
You can now move the window by dragging empty space in the top part of a webpage, with native snapping and tiling, just like dragging the titlebar. Links, buttons, and other interactive elements still work as usual.
You can now have multiple media controls in the sidebar, allowing you to control multiple media sources at once.
Improved startup performance and feeling

Release notes for version 1.21.10b

Wed, 29 Jul 2026 00:00:00 GMT

If you encounter any issues, please report them on the issues page. Thanks everyone for your feedback! ❤️

✓ Fixes

Various performance fixes, energy consumption improvements, RTX Super Resolution not working, and HDR video playback not working on Windows.

NOTE: This might need a restart to take effect (#14292)
Fixed extra divider when urlbar has no results (#14717)
Fix boost applying wrong size override (#14461)
Fixed crashes/hangs when creating new spaces (#14713)
Fixed non-tab drags allowing to switch Spaces (#14724)
Fixed essential tab reordering not working at maximum capacity (#14726)
Fixed compact sidebar activation at right screen edge (#14409)
Other bug fixes and improvements.

⭐ Features

Updated Firefox to 153.0.1

Release notes for version 1.21.9b

Thu, 23 Jul 2026 00:00:00 GMT

If you encounter any issues, please report them on the issues page. Thanks everyone for your feedback! ❤️

✓ 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.

⭐ 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.

Release notes for version 1.21.8b

Fri, 17 Jul 2026 00:00:00 GMT

If you encounter any issues, please report them on the issues page. Thanks everyone for your feedback! ❤️

✓ Fixes

Fixed essentials promo UI leaving gap on pressing Esc (#14544)
Fixed localization strings not being translated in some places (#14605)
Fixed new Spaces not being able to be removed (#14618)
Fixed split view drag and drop ending up opening new windows (#14619)
Other bug fixes and improvements.

⭐ Features

Release notes for version 1.21.7b

Wed, 15 Jul 2026 00:00:00 GMT

If you encounter any issues, please report them on the issues page. Thanks everyone for your feedback! ❤️

✓ Fixes

Fixed essentials promo UI leaving gap on pressing Esc (#14544)
Fixed misaligned symbolic space icons in Space options menu on Linux (#14495)
Fixed Spaces switching when dragging tab to another monitor (#14511)
Fixed tab order flipping when moving tabs between workspaces (#14495)
Fixed a hang that could occur after using a file picker dialog on macOS 26
Other bug fixes and improvements.

⭐ Features

Updated to Firefox 152.0.6

Release notes for version 1.21.6b

Tue, 07 Jul 2026 00:00:00 GMT

If you encounter any issues, please report them on the issues page. Thanks everyone for your feedback! ❤️

✓ Fixes

Fixed some localization strings not being translated in some places (#10749)
Fixed glance being able to be open a second time when it was already open (#14460)
Other bug fixes and improvements.

⭐ Features

Updated to Firefox 152.0.5

Release notes for version 1.21.5b

Wed, 01 Jul 2026 00:00:00 GMT

If you encounter any issues, please report them on the issues page. Thanks everyone for your feedback! ❤️

✓ Fixes

Fixed overflowing addons not having context menus (#14382)
Fixed copy, paste, undo, redo, and similar keyboard shortcuts not working inside macOS system dialogs such as the Save and Open panels.
Other bug fixes and improvements.

⭐ Features

Updated to Firefox 152.0.4

Release notes for version 1.21.4b

Fri, 26 Jun 2026 00:00:00 GMT

If you encounter any issues, please report them on the issues page. Thanks everyone for your feedback! ❤️

✓ 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.

⭐ 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

Release notes for version 1.21.3b

Thu, 18 Jun 2026 00:00:00 GMT

If you encounter any issues, please report them on the issues page. Thanks everyone for your feedback! ❤️

✓ Fixes

Fixed transparency not working after updating to 1.21.2b (#14259)
Fixed frequent crashes affecting users with Intel Raptor Lake processors
Fixed an issue on macOS where choosing a PDF option, such as "Save as PDF", from the system print dialog would send the job to your printer instead of saving a file.
Other minor bug fixes and improvements.

⭐ Features

Updated to Firefox 152.0.1

Release notes for version 1.21.2b

Tue, 16 Jun 2026 00:00:00 GMT

If you encounter any issues, please report them on the issues page. Thanks everyone for your feedback! ❤️

✓ Fixes

Fixed space routing overriding tabs with an explicit container (#14242)
Fixed background tabs focusing on routed tabs (#14165)
Fixed opening glance on links while selecting text in links (#8391)
Other minor bug fixes and improvements

⭐ Features

Updated to Firefox 152.0
Improved support for more advanced cursor movement commands, including those relating to paragraph boundaries, on macOS.
On Windows and Linux, you can now copy links via the tab context menu by right-clicking a tab and selecting Share > Copy Link, making it easy to copy a link without switching to the tab first.

Release notes for version 1.21.1b

Sat, 13 Jun 2026 00:00:00 GMT

If you encounter any issues, please report them on the issues page. Thanks everyone for your feedback! ❤️

✓ Fixes

Fixed duplicate bookmarks appearing when re-opening a window in MacOS (#9540)
Fixed freezes when switching spaces on certain occasions (#14110)
Improved performance for switching between tabs
Other minor bug fixes and improvements

Release notes for version 1.21b

Thu, 11 Jun 2026 00:00:00 GMT

If you encounter any issues, please report them on the issues page. Thanks everyone for your feedback! ❤️

✓ Fixes

Fixed extension-opened tabs not being created with the correct container (#14100)
Fixed a bug with the Boosts editor having the wrong theme colors (#14099)
Improved overflowing space icons being inaccessible and improved the feeling when hovering over them (#13747)
Other minor bug fixes and improvements

⭐ Features

Updated to Firefox 151.0.4
Added 'Space Routing', a new feature that allows you to route links to a specific Space. To get started, click on the three dots in your Space name and click on 'Space Routing Settings'.

Release notes for version 1.20.2b

Wed, 03 Jun 2026 00:00:00 GMT

If you encounter any issues, please report them on the issues page. Thanks everyone for your feedback! ❤️

✓ Fixes

Fixed auto focus for new windows not working. (#12112)
Fixed desktop shortcuts showing zen as 'Nightly'. (#13745)
Other minor bug fixes and performance improvements.

⭐ Features

Updated to Firefox 151.0.3
Boosts now support a dark mode UI based on your system dark mode setting.

Release notes for version 1.20.1b

Wed, 27 May 2026 00:00:00 GMT

If you encounter any issues, please report them on the issues page. Thanks everyone for your feedback! ❤️

✓ Fixes

Fixed pressing `u` duplicating tabs. (#13851)
Fixed video controls going under the screen when in fullscreen mode. (#10594)
Fixed boosts not working for certain websites. (#13844)
Fixed an issue on macOS where smart cards and security keys could fail to load certificates automatically
Other minor bug fixes and performance improvements.

⭐ Features

Updated to Firefox 151.0.2
You can now type `New Boost` in the urlbar to quickly create a new boost for the current site!

Release notes for version 1.20b

Thu, 21 May 2026 00:00:00 GMT

If you encounter any issues, please report them on the issues page. Thanks everyone for your feedback! ❤️

This release includes a major new feature called Boosts! Boosts allow you to customize the look and feel of any website to your liking. To start boosting, click the site's control icon in the urlbar and click the new 'Boost' button.

✓ Fixes

Fixed a bug where the url would be cut off when the urlbar was too small. (#13719)
Fixed 'go back to original url' button on pinned tabs showing up even when the url was not modified. (#12949)
Added better support for cyclic workspace switching
Fixed video controls going under the screen when in fullscreen mode. (#10594)
Fixed closing a split view in one window selecting it on other windows. (#13761)

⭐ Features

Updated to Firefox 151.0 and 151.0.1
Boosts are now in Zen! This allows you to tint colors, customize fonts and styles, zap elements and enable automatic dark mode on any website!
Overflowing web extensions will now appear below the urlbar instead of being added back into the site control panel. This only happens in single-sidebar mode.
Zen now strengthens protection against fingerprinting in Standard Enhanced Tracking Protection, making it harder for websites to track you across sites by limiting the amount of information revealed about your device and browser. This reduces the number of users uniquely identifiable by common fingerprinting techniques by an average of ~14%, and by ~49% on macOS.
You can now merge multiple PDFs directly in Zen PDF. Combine separate PDF files into a single document without ever leaving Zen or relying on third-party tools.

Release notes for version 1.19.13b

Wed, 13 May 2026 00:00:00 GMT

If you encounter any issues, please report them on the issues page. Thanks everyone for your feedback! ❤️

✓ Fixes

Fixed native popovers not working after using dropdowns (#13623)
Fixed unresponsive tabs when opening external links (#13620)
Fixed tab renaming input fields being too narrow (#13629)
Other minor bug fixes and performance improvements.

⭐ Features

Updated to Firefox 150.0.3

Release notes for version 1.19.12b

Fri, 08 May 2026 00:00:00 GMT

If you encounter any issues, please report them on the issues page. Thanks everyone for your feedback! ❤️

✓ Fixes

Fixed search engines not being visible in settings (#13522)
Fixed Previous Space in MacOS menu bar not working (#13583)
The loading indicator should now show on-top of the webview for double toolbar mode (#13516)
Fix macos crash when native popovers are closed on some occasions (#13294)
Fixed glance having wrong image preview when zoomed in
Other minor bug fixes and performance improvements.

⭐ Features

Updated to Firefox 150.0.2
Improved space swiping feel and performance
The option for 'Create new space' keyboard shortcut has been added to the keyboard shortcuts settings.
Desktop files on linux should now ship with translations for desktop entries.

Release notes for version 1.19.11b

Wed, 29 Apr 2026 00:00:00 GMT

If you encounter any issues, please report them on the issues page. Thanks everyone for your feedback! ❤️

✓ Fixes

Fixed topbar dropping down when titlebar is enabled (#7094)
Fixed auto hide not working after installing an extension (#13488)
Fixed dragging folders around not working properly (#13492)
Other minor bug fixes and performance improvements.

⭐ Features

Updated to Firefox 150.0.1
Added a space-only search mode for the urlbar, which can be enabled by typing ` + space in the urlbar.