# Zen Browser changelog > Zen Browser release notes. - Vendor: Zen Browser - Category: Browsers - Official site: https://zen-browser.app/ - Tracked by: What's New (https://whatsnew.fyi/product/zen-browser) - Harvested from: GitHub (zen-browser/desktop) - Entries below: 10 (newest first) What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog. ## Releases ### 1.21.10b — Release build - 1.21.10b (2026-07-29) - Date: 2026-07-30 - Version: 1.21.10b - Original notes: https://github.com/zen-browser/desktop/releases/tag/1.21.10b - Permalink: https://whatsnew.fyi/product/zen-browser/releases/1.21.10b #### 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](https://github.com/zen-browser/desktop/issues/14292)) - Fixed extra divider when urlbar has no results ([#14717](https://github.com/zen-browser/desktop/issues/14717)) - Fix boost applying wrong size override ([#14461](https://github.com/zen-browser/desktop/issues/14461)) - Fixed crashes/hangs when creating new spaces ([#14713](https://github.com/zen-browser/desktop/issues/14713)) - Fixed non-tab drags allowing to switch Spaces ([#14724](https://github.com/zen-browser/desktop/issues/14724)) - Fixed essential tab reordering not working at maximum capacity ([#14726](https://github.com/zen-browser/desktop/issues/14726)) - Fixed compact sidebar activation at right screen edge ([#14409](https://github.com/zen-browser/desktop/issues/14409)) - Other bug fixes and improvements. ### 1.21.9b — Release build - 1.21.9b (2026-07-25) - Date: 2026-07-25 - Version: 1.21.9b - Original notes: https://github.com/zen-browser/desktop/releases/tag/1.21.9b - Permalink: https://whatsnew.fyi/product/zen-browser/releases/1.21.9b #### Zen Stable Release ##### Security - https://www.mozilla.org/en-US/security/advisories/mfsa2026-68/ ##### New 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. ##### Fixes - Fixed 'Add tab to essentials' context menu item being always disabled ([#14616](https://github.com/zen-browser/desktop/issues/14616)) - Fixed external links not being routed properly by Space Routing ([#14600](https://github.com/zen-browser/desktop/issues/14600)) - Fixed boosts size override not persisting ([#14461](https://github.com/zen-browser/desktop/issues/14461)) - Other bug fixes and improvements. ### 1.21.8b — Release build - 1.21.8b (2026-07-16) - Date: 2026-07-17 - Version: 1.21.8b - Original notes: https://github.com/zen-browser/desktop/releases/tag/1.21.8b - Permalink: https://whatsnew.fyi/product/zen-browser/releases/1.21.8b #### Zen Stable Release ##### Fixes - Fixed essentials promo UI leaving gap on pressing Esc ([#14544](https://github.com/zen-browser/desktop/issues/14544)) - Fixed localization strings not being translated in some places ([#14605](https://github.com/zen-browser/desktop/issues/14605)) - Fixed new Spaces not being able to be removed ([#14618](https://github.com/zen-browser/desktop/issues/14618)) - Fixed split view drag and drop ending up opening new windows ([#14619](https://github.com/zen-browser/desktop/issues/14619)) - Other bug fixes and improvements. ### 1.21.7b — Release build - 1.21.7b (2026-07-15) - Date: 2026-07-15 - Version: 1.21.7b - Original notes: https://github.com/zen-browser/desktop/releases/tag/1.21.7b - Permalink: https://whatsnew.fyi/product/zen-browser/releases/1.21.7b #### Zen Stable Release ##### Security - https://www.mozilla.org/en-US/security/advisories/mfsa2026-67/ ##### New Features - Updated to Firefox 152.0.6 ##### Fixes - Fixed essentials promo UI leaving gap on pressing Esc ([#14544](https://github.com/zen-browser/desktop/issues/14544)) - Fixed misaligned symbolic space icons in Space options menu on Linux ([#14495](https://github.com/zen-browser/desktop/issues/14495)) - Fixed Spaces switching when dragging tab to another monitor ([#14511](https://github.com/zen-browser/desktop/issues/14511)) - Fixed tab order flipping when moving tabs between workspaces ([#14495](https://github.com/zen-browser/desktop/issues/14495)) - Fixed a hang that could occur after using a file picker dialog on macOS 26 - Other bug fixes and improvements. ### 1.21.6b — Release build - 1.21.6b (2026-07-08) - Date: 2026-07-09 - Version: 1.21.6b - Original notes: https://github.com/zen-browser/desktop/releases/tag/1.21.6b - Permalink: https://whatsnew.fyi/product/zen-browser/releases/1.21.6b #### Zen Stable Release ##### New Features - Updated to Firefox 152.0.5 ##### Fixes - Fixed some localization strings not being translated in some places ([#10749](https://github.com/zen-browser/desktop/issues/10749)) - Fixed glance being able to be open a second time when it was already open ([#14460](https://github.com/zen-browser/desktop/issues/14460)) - Other bug fixes and improvements. ### 1.21.5b — Release build - 1.21.5b (2026-07-02) - Date: 2026-07-02 - Version: 1.21.5b - Original notes: https://github.com/zen-browser/desktop/releases/tag/1.21.5b - Permalink: https://whatsnew.fyi/product/zen-browser/releases/1.21.5b #### Zen Stable Release ##### Security - https://www.mozilla.org/en-US/security/advisories/mfsa2026-62/ ##### New Features - Updated to Firefox 152.0.4 ##### Fixes - Fixed overflowing addons not having context menus ([#14382](https://github.com/zen-browser/desktop/issues/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. ### 1.21.4b — Release build - 1.21.4b (2026-06-25) - Date: 2026-06-27 - Version: 1.21.4b - Original notes: https://github.com/zen-browser/desktop/releases/tag/1.21.4b - Permalink: https://whatsnew.fyi/product/zen-browser/releases/1.21.4b #### Zen Stable Release ##### New 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 ##### Fixes - Prevent sidebar from flickering when moving a tab ([#14131](https://github.com/zen-browser/desktop/issues/14131)) - Full-screening while on a glance tab will now expand the glance tab to a normal tab ([#11766](https://github.com/zen-browser/desktop/issues/11766)) - Fixed space routing tabs opening in background when it should be in foreground ([#14183](https://github.com/zen-browser/desktop/issues/14183)) - Other minor bug fixes and improvements. ### 1.21.3b — Release build - 1.21.3b (2026-06-18) - Date: 2026-06-18 - Version: 1.21.3b - Original notes: https://github.com/zen-browser/desktop/releases/tag/1.21.3b - Permalink: https://whatsnew.fyi/product/zen-browser/releases/1.21.3b #### Zen Stable Release ##### New Features - Updated to Firefox 152.0.1 ##### Fixes - Fixed transparency not working after updating to 1.21.2b ([#14259](https://github.com/zen-browser/desktop/issues/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. ### 1.21.2b — Release build - 1.21.2b (2026-06-17) - Date: 2026-06-17 - Version: 1.21.2b - Original notes: https://github.com/zen-browser/desktop/releases/tag/1.21.2b - Permalink: https://whatsnew.fyi/product/zen-browser/releases/1.21.2b #### Zen Stable Release ##### Security - https://www.mozilla.org/en-US/security/advisories/mfsa2026-57/ ##### New 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. ##### Fixes - Fixed space routing overriding tabs with an explicit container ([#14242](https://github.com/zen-browser/desktop/issues/14242)) - Fixed background tabs focusing on routed tabs ([#14165](https://github.com/zen-browser/desktop/issues/14165)) - Fixed opening glance on links while selecting text in links ([#8391](https://github.com/zen-browser/desktop/issues/8391)) - Other minor bug fixes and improvements ##### Changes - 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. ### 1.21.1b — Release build - 1.21.1b (2026-06-12) - Date: 2026-06-13 - Version: 1.21.1b - Original notes: https://github.com/zen-browser/desktop/releases/tag/1.21.1b - Permalink: https://whatsnew.fyi/product/zen-browser/releases/1.21.1b #### Zen Stable Release ##### Fixes - Fixed duplicate bookmarks appearing when re-opening a window in MacOS ([#9540](https://github.com/zen-browser/desktop/issues/9540)) - Fixed freezes when switching spaces on certain occasions ([#14110](https://github.com/zen-browser/desktop/issues/14110)) - Improved performance for switching between tabs - Other minor bug fixes and improvements