Zen Browser Release Notes

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

✓ Fixes

• Fixed transparent sidebars having low opacity.
• Fixed downloads failing on macOS when Firefox is set to ask where to save files but doesn't have permission to access the Downloads folder.
• Other bug fixes and improvements.

⭐ Features

• Updated to Firefox 157.0.1
• Added an option in the Library to filter closed tabs instead of history entries.
• A keyboard shortcut (opt/alt + shift + L) has been added to quickly open the Library.
• 'Clear all downloads' and 'Clear history' options have been added to the Library by right clicking on the respective section tabs.

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

Introducing Library! A better place to organize and access your history, media, downloads, spaces and more.

✓ Fixes

• Significant performance improvements on startups/new windows when there are lots of tabs open.
• Certain icon animations like the boost indicator or musical notes on the sidebar are now more performant. (#15299)
• Fixed status panel and glance controls not using the correct theme colors. (#15280)
• Fixed some HDR videos encoded in 8-bit color formats looking dull and gray on Windows instead of displaying in HDR.
• Improved audio and video synchronization when repeatedly changing the playback speed of videos, for example on YouTube.
• Fixed an issue on Windows where making a video full screen would leave the Windows taskbar showing over the video.

⭐ Features

• Introducing Library! A better place to organize and access your history, media, downloads, spaces and more.
• You can now resize the sidebar even when its hidden. If the sidebar is resized too small, it will automatically hide itself.
• Updated to Firefox 157.0
• WebRTC video calls can now use hardware AV1 decoding on devices that support it, instead of always decoding AV1 video in software.

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

✓ Fixes

• Fixed Zen leaking system handles on Windows as content processes were started and stopped.
• Fixed context menu actions on the urlbar not working. (#15437)
• Fixed overflow-extension order in single toolbar mode. (#15419)
• Fixed not being able to install add-ons while in compact mode. (#15445)
• Fixed Zen windows on macOS 27 immediately returning to maximized after being restored by double-clicking the title bar.
• Other bug fixes and improvements.

⭐ Features

• Updated to Firefox 156.0.1
• The command bar now allows you to search through tabs and folders more efficiently.

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

✓ Fixes

• Fixed high-sample-rate FLAC audio in MP4 failing to play on certain video sites.
• Fixed subtitles not appearing in the Picture-in-Picture window when they are turned on in the video player after the window has already opened.
• Fixed the find bar becoming permanently unavailable in a tab after reversing the panes in Split View.
• Fixed some sites failing to load when DNS over HTTPS is enabled and the site does not support HTTPS.
• Fixed an issue on Windows where Zen could block an auto-hiding taskbar from showing.
• Fixed the sidebar not hiding if the urlbar is open when compact mode is enabled. (#13196)
• Fixed an issue where cross-space tab routing would freeze the browser under certain conditions. (#14171)
• Fixed cross-device sync losing certain tabs if they are created too quickly (#15380)
• Fixed certain issues related to live folders appearing as active even when they are no tabs showing in them.
• Other bug fixes and improvements.

⭐ Features

• Updated to Firefox 156.0
• Zen on macOS can now be set to open automatically when the computer starts up, from the Startup section of Settings. …

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

✓ Fixes

• Noticeably improved performance and battery usage while scrolling, and playing videos.
• Other bug fixes and improvements.

⭐ Features

• You now have the option to sync normal tabs across devices along with your Spaces, Folders, and other data. This can be enabled in Settings > Sync > Sync your Spaces across devices.
• You can now share Spaces, folders and split views to other Zen users and non-Zen users via a shareable link. This can be found in the context menu of a Space, folder or split view.
• The on-boarding experience will now ask if you want to enable ad blocking, which will install uBlock Origin for enhanced privacy and security.

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

This release includes a major new feature to sync your Spaces across devices using your Mozilla account! Please note that the first time this feature is enabled, it will merge both your local and cloud Spaces.

✓ Fixes

• Fixed live folders for GitHub issues not working with the new GitHub UI
• Fixed Zen preventing Linux systems from going to sleep after a long browsing session.
• Fixed arrow-key and Page Up/Down scrolling not working on some pages with embedded content from other sites.
• Fixed live audio streams such as internet radio stopping when playing in the background.
• Other bug fixes and improvements.

⭐ Features

• Updated to Firefox 155.0 and 155.0.1
• By using your Mozilla account, you can now sync your Spaces, Folders, Tabs, and much more between devices! This can be enabled in Settings > Sync > Sync your Spaces across devices.
• The chrome UI now has a better look and feel, implementing squircles and other design elements to make it more visually appealing.
• A new on-boarding experience has been added to help new users get started with the browser and its features.
• Creating a new Space is now faster and requires less animation wait time, making the process more efficient.
• Containers can now be reordered in Settings, and the new order is used wherever containers are listed.

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

✓ Fixes

• Improved on session store performance, lowering CPU usage spikes and disk usage when storing the session (#14990)
• Fixed duplicate separator on tab context menu (#15031)
• Fixed minimizing PiP window failing to collapse into the sidebar (#14710)
• Fixed slower access to saved passwords and unexpected Primary Password prompts caused by recent changes to password storage.
• Fixed an issue where addresses were failing to autofill on some sites.
• Other bug fixes and improvements.

⭐ Features

• Update Firefox version to 154.0.1

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. …

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

✓ Fixes

• Fixed feature callouts not using native panels (#14912)
• Fixed hang when using the same tab in 2 windows with different containers (#14905)
• Other bug fixes and improvements.

⭐ Features

• Update Firefox version to 153.0.4
• Added support for FFmpeg 63

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

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

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.

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

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