Security

Various security fixes.

Fixed

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

Added

• Updated to Firefox 152.0.6

Fixed

Prevent sidebar from flickering when moving a tab (Bug gh-14131)

Full-screening while on a glance tab will now expand the glance tab to a normal tab (Bug gh-11766)

Fixed space routing tabs opening in background when it should be in foreground (Bug gh-14183)

Other minor bug fixes and improvements.

Added

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

Security

Various security fixes.

Fixed

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

Added

• 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.

Change

• Site zooming via keyboard or mouse now offers more zoom levels in smaller increments than before.
• When a PDF or other file that Zen opens directly finishes downloading, it now opens in a background tab if you've switched tabs or closed the original page.

Fixed

Fixed extension-opened tabs not being created with the correct container (Bug gh-14100)

Fixed a bug with the Boosts editor having the wrong theme colors (Bug gh-14099)

Fixed

Fixed
Improved overflowing space icons being inaccessible and improved the feeling when hovering over them (Bug gh-13747)

Fixed

Other minor bug fixes and improvements

Added

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'.

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

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.