New Update Zen Browser Updates

Release build - 1.21.10b (2026-07-29)

New Features​

  • Updated Firefox to 153.0.1

Fixes​

  • Various performance fixes, RTX Super Resolution not working, and HDR video playback not working on Windows (#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.
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Release Release build - 1.21.10b (2026-07-29) · zen-browser/desktop

Zen Stable Release New Features Updated Firefox to 153.0.1 Fixes Various performance fixes, RTX Super Resolution not working, and HDR video playback not working on Windows (#14292) Fixed extra d...
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Release build - 1.21.11b (2026-08-06)

New 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

Fixes​

  • Fixes issue setting keybinds with shift + digit or symbol (#9918)
  • Fix closing split tab in one window changing focus of other windows (#13761)
  • Other bug fixes and improvements.
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Release Release build - 1.21.11b (2026-08-06) · zen-browser/desktop

Zen Stable Release New 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 si...
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Release build - 1.21.13b (2026-08-09)

Fixes​

  • Fixed infinite media players appearing infinitely in the sidebar when a page has multiple media players.
  • Other bug fixes and improvements.
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Release Release build - 1.21.13b (2026-08-09) · zen-browser/desktop

Zen Stable Release Fixes Fixed infinite media players appearing infinitely in the sidebar when a page has multiple media players. Other bug fixes and improvements.
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Release build - 1.21.14b (2026-08-11)

New Features​

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

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.
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Release Release build - 1.21.14b (2026-08-11) · zen-browser/desktop

Zen Stable Release New Features Update Firefox version to 153.0.4 Added support for FFmpeg 63 Fixes Fixed feature callouts not using native panels (#14912) Fixed hang when using the same tab in ...
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Release build - 1.21.15b (2026-08-18)

Security​

New 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.
  • Sites can now be exempted from having their cookies and site data cleared on shutdown without also being exempted from tracking protection and other cookie restrictions.
  • The full-page Translations feature now translates <iframe> content.
  • The full-page Translations feature now runs language identification on all page loads, resulting in an improved experience for offering translations to users.
  • Performing a hard reload on a page (holding Shift while clicking the Refresh button) now also clears and updates its cached favicons.

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.

Known Issues​

  • Following recent changes to Zen's password storage, some users may experience slower performance when Zen accesses saved passwords. Users with a Primary Password enabled may also see unexpected password prompts, such as when starting Zen or opening certain content.
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Release Release build - 1.21.15b (2026-08-18) · zen-browser/desktop

Zen Stable Release Security https://www.mozilla.org/en-US/security/advisories/mfsa2026-74/ New Features Update Firefox version to 154.0 Local Zen profile backups are now available on macOS in ad...
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