Zen Browser Release Notes

If you encounter any issues, please report them on the issues page.

Security

Various security fixes.

Fixed

Fixed pressing u duplicating tabs. (Bug gh-13851)

Fixed video controls going under the screen when in fullscreen mode. (Bug gh-10594)

Fixed boosts not working for certain websites. (Bug gh-13844)

Fixed an issue on macOS where smart cards and security keys could fail to load certificates automatically

Fixed

Other minor bug fixes and performance improvements.

Added

Updated to Firefox 151.0.2

Added

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

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.

If you encounter any issues, please report them on the issues page.

Security

Various security fixes.

Fixed

Fixed a bug where the url would be cut off when the urlbar was too small. (Bug gh-13719)

Fixed 'go back to original url' button on pinned tabs showing up even when the url was not modified. (Bug gh-12949)

Added better support for cyclic workspace switching

Fixed video controls going under the screen when in fullscreen mode. (Bug gh-10594)

Fixed closing a split view in one window selecting it on other windows. (Bug gh-13761)

Added

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.

Change

Geolocation on Windows now respects the user's Windows location permission setting, instead of overriding it, when the user grants location permission to a page. Zen will ask users to enable the Windows permission if it is needed.

Security

Various security fixes.

Security

CVE-2026-44658

Security

CVE-2026-44659

Fixed

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

Other minor bug fixes and performance improvements.

Added

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

Security

Various security fixes.

Security

Various security fixes.

Fixed

Fixed halts / unresponsiveness happening every certain amount of time (Bug gh-10649)

Fixed

Fixed duplicate bookmarks appearing on startup (Bug gh-9540)

Fixed

Fixed an issue on macOS where, when macOS Lockdown mode is enabled, emoji characters are not displayed in web content.

Fixed

Fixed live folders not working with GitHub's new Pull Request UI

Fixed

Windows users can now install updates without having to accept the User Account Control (UAC) prompt. It might need a re-install to work for existing users.

Fixed

Other minor bug fixes and performance improvements.

Added

Updated to Firefox 150.0

Added

(alt or opt)+clicking a tab will now split it with the selected tab

Added

Added a 'Move to folder...' context menu item for tabs to quickly move them to a different folder

Added

Added a new loading progress animation when a page is loading

Added

Safebrowsing and geo-location APIs should work more reliably now

Change

There's a new modal UI, thanks to @12th-devs on GitHub!

Known

Essentials and folders colors appear too-saturated when using certain themes. This will be fixed in the next release.

Please see the 1.19.7b release for more details on the fixes included in this release.

Fixed

Fixed some animations inside Zen not respecting the 'reduce motion' system setting (Bug gh-13140)

Fixed

Fixed compact mode not hiding the sidebar or toolbar when a site has permissions disabled (Bug gh-13121)

Fixed

Fixed accessibility issues with some toolbars such as 'find on page' in private windows

Change

Modified sidebar context menu to be more intuitive and simplified, removing some options and moving others to more appropriate places.

Change

Live folders option has been moved to the sidebar context menu

Security

Various security fixes.

Fixed

• Fixed MacOS setting 'disable page swipe' making switching spaces not work at all (Bug gh-10687)
• Fixed double separator lines in context menus in some places (Bug gh-13093)
• Fixed unable to install addons in compact mode (Bug gh-11667)
• Fixed an issue on Linux where the browser toolbar could become unresponsive to mouse clicks after dragging a tab when using Wayland
• Fixed Other stability fixes and improvements.

Added

• Updated to Firefox 149.0.2
• Added a new 'Duplicate tab' keyboard shortcut available in settings

Fixed

• Fixed compact mode toggle being appear checked incorrectly (Bug gh-12973)

• Zen now respects more 'reduce motion' system settings to disable or simplify non-essential animations

• Switching spaces will not be blocking anymore, meaning you can switch to another space while the current one is still animating (Bug gh-8206)

• Fixed website notifications not being clickable when using the right sidebar (Bug gh-12104)

• Improved low-FPS performance on certain occasions, such as when playing videos or using glance on low-end devices (Bug gh-12979)

• Fixed restoring a pinned tab also scrolling the website to it's original position (Bug gh-13024)

• Fixed some toolbars having unreadable text colors when using certain themes (Bug gh-13024)

Change

• Reverted to Firefox's old search bar due to compatibility issues with the new one

• Context menu for split tabs has now been renamed to 'Join tabs' to be more intuitive

Security

Various security fixes.

Fixed

Fixed background grain not showing properly

Fixed

Fixed not being able to switch spaces with scroll actions

Fixed

Fixed closing blank windows when asking for confirmation

Fixed

Increased robustness of HTTP/3 upload performance for unstable network conditions.

Fixed

Other minor bug fixes and improvements.

Added

Updated to Firefox 149.0

Added

Optimized the performance glance and its animations, making it more responsive and smoother than before.

Added

Added a 'Un-split tabs' context menu item when right-clicking on a tab inside a split view to quickly un-split it.

Added

Many PDF files will now load significantly faster thanks to hardware acceleration.

Added

Zen now automatically blocks notifications and permanently revokes permissions for any website flagged as malicious by SafeBrowsing. This prevents unsafe sites from sending background notifications to users, commonly used for ads, spam or phishing.

Added

The WebRender layer compositor is now enabled on Windows, reducing power usage during full-screen video playback and improving WebGL/WebGPU performance.

Change

Live folders will now perform a refresh when waking up the computer to make sure the content is up to date.

Change

On Linux, Zen will now default to the XDG portal file picker if available, rather than the GTK3 one, which is usually better integrated with the user's desktop environment, and more powerful.

Change

On Windows, Zen will use the modern Windows.Devices.Geolocation API for geolocation instead of Windows 7 location API.

Fixed

Split views will now hide when toggling fullscreen mode.

Other minor bug fixes and improvements.

Improved accessibility for split view controls.

Fixed opening a new window making all tabs appear as 'New Tab' until they are selected.

Fixed chrome hide toolbar flag not being respected for new windows.

Others fixes and quality of life improvements

Added

Holding ctrl/cmd while hovering 'Reset pinned tab' will now duplicate that tab in the background

Added 'Unload all spaces except current' context menu item to the space switcher

Change

Pressing CTRL+T again while the urlbar is open will now close it.

Bookmarks bar will now stay visible on fullscreen mode.

Fixed

• Fixed certain popups on MacOS appearing with no background color, making them invisible.
• Fixed Github Pull Request live folders not fetching the pull request data correctly.
• Fixed Other minor bug fixes and improvements.

Change

• Change Middle clicking on the sidebar will now simply open a new tab instead of searching the content stored inside the clipboard. This is to prevent accidental middle clicks from opening sensitive information. Middle clicking on the new tab button will still search the clipboard content.