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Every release, on the record.

Latest Waterfox release notes, updates, and improvements.

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1.2.8 Historical app icons, homepage controls and tab fixes

Android

Features include the Gecko 156.0 engine, historical Waterfox app icons, new homepage and theme controls, extension installation from file, and fixes for widgets, collections, private browsing and file uploads.

  • Updates the underlying Gecko browser engine to version 156.0.
  • Adds historical Waterfox app icons, a Black system-theme option and theme navigation fixes.
  • Exposes homepage-as-new-tab and Show more shortcuts in Home settings, and fixes the search widget overwriting the current tab.
  • Exposes extension installation from file and adds confirmation before removing tabs from collections.
  • Fixes private erase leaving stray tabs and notifications, and file selection failing when permissions are denied.
  • Preserves existing choices for configurable features.
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6.7.3 Auto-hide vertical tabs and appearance fixes

Desktop

Auto-hide vertical tabs, prevent tabs from widening when audio plays, and benefit from fixes for older extensions, sidebar controls and tab appearance.

  • Adds an option to hide vertical tabs automatically until you move your mouse to the edge of the window.
  • Adds a setting to prevent audio indicators from changing tab widths.
  • Restores country flag emoji on Windows and fixes loading issues with older extensions.
  • Fixes active tab highlighting, close buttons and the New Private Tab button in the vertical sidebar.
  • Corrects menu spacing, button appearance, custom new tab address entry and Waterfox branding.
  • Improves JPEG XL compatibility and restores the standard new tab page layout, with recommended stories and sponsored content still disabled.
  • Includes the security fixes covered by Mozilla Foundation Security Advisory 2026-93.
View full notes

6.7.2 Improvements to tree tabs and the vertical sidebar

Desktop

Tree tabs are more reliable, with more control over their behaviour, fixes for the vertical sidebar, and security updates outlined in MFSA 2026-85.

  • Improves the restoration, visibility, dragging and alignment of tab trees, as well as the handling of bookmarked trees.
  • The option to automatically collapse other trees when switching between them is now off by default, and any explicitly chosen settings are preserved.
  • Adds more tree controls directly to the Settings menu, including options for indentation, nesting limits, selecting tabs after closing a tab and handling dropped links.
  • Fixes issues with pinned tabs, hover expansion, full-screen video and the collapsed sidebar layout.
  • Unloaded tabs keep their colourful icons, and the titles of unread background tabs are no longer italicised by default. Greyscale icons and italic titles can be re-enabled in Settings.
  • Includes the security fixes covered by Mozilla Foundation Security Advisory 2026-85.
View full notes

1.2.7 Tab groups, homepage improvements and privacy controls

Android

Features include the Firefox 155.0.1 engine, tab groups enabled by default, a customisable homepage, classic Fennec wallpapers, importing and PDF tools, and stronger privacy safeguards.

  • Updates the underlying Firefox browser engine to version 155.0.1.
  • Enables tab groups and homepage customisation, as well as swipeable shortcut pages and toolbar animations, while keeping Collections available.
  • Adds five classic Fennec wallpapers, with offline portrait and landscape versions, as well as theme and branding fixes.
  • Enables the import of bookmarks and passwords by default, as well as the new PDF viewer tools.
  • Enables Local Network Access protections and strengthens safeguards against unwanted telemetry, experiments and marketing notifications.
  • Preserves existing choices for configurable features, while ensuring that features disabled by Waterfox’s privacy policy remain unavailable.
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6.7.1 Fine Tuning

Desktop

This release restores the full set of interface customisation controls missing in version 6.7, as well as the last four missing privacy toggles. It also extends the tree tabs feature with group tabs, split view, native tab groups, and bookmark folder trees.

  • Restores over 120 interface customisation options to the Settings menu, grouped by tab bar, tabs, toolbars, bookmarks, icons, rounding, theme, content, new tab and video player.
  • Brings back the WebRTC peer connection toggle, the referrer header policy menu, and the `Load images` and `Enable JavaScript` checkboxes, all of which are now located in the Privacy pane.
  • Adds group tabs to tree tabs: a named placeholder tab that stands in for a parent and can be closed when empty.
  • Tree tabs now work with split view and native tab groups, and bookmark folders can restore a saved tree structure when opened.
  • Adds a new tab position chooser to the tab strip, as well as a dialogue for links dropped onto a tab.
  • Moves the density picker into Appearance alongside the browser style and palette controls.
  • DRM playback is now disabled by default, and form autofill is available in every region.
  • The browser style is no longer lost when upgrading a profile from 6.7.
View full notes

6.7.0 Supernova

Desktop

Waterfox 6.7 has moved to the ESR 153 platform and now features native tree tabs, the Nova style, and twelve colour palettes. It also boasts a rebuilt ad blocker panel, legacy extension support, a new setup flow, and update controls that finally deliver on their promises.

  • Upgrades the underlying platform from ESR 140 to ESR 153, incorporating a year's worth of improvements to the engine, performance and security.
  • Rebuilds tree-style tabs as a native feature of the vertical tab strip, replacing the 6.6 bundled Tree Style Tab fork.
  • Adds Nova, a new browser style to sit alongside Proton and Photon, plus twelve colour palettes with light and dark variants.
  • Redesigns the ad blocker panel to include a status hero, separate ad, tracker and pop-up counts, and a breakdown of what was blocked on the page.
  • Restores legacy extension support, covering restartless, overlay-based and restart-required add-ons with integration in about:addons.
  • Rebuilds the onboarding setup as a five-step process covering language, import options, appearance, tab layout and privacy settings.
  • Adds update controls under Settings and fixes `Check for updates` so that it only checks.
  • Adds ARM64 builds for every platform, plus official Linux package repositories with DEB and RPM packages.
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6.7.0-beta.3 Ultra Protection returns and Linux package repositories

Desktop
Beta

Third 6.7.0 beta re-enabling DNS over Oblivious HTTP by default, adding ARM64 Linux packages and a redesigned About dialog, and extending legacy extension support to overlay-based add-ons.

  • Re-enables Ultra Protection by defaulr
  • Extends legacy extension support to overlay-based extensions using `chrome.manifest` overlay entries.
  • Publishes ARM64 DEB and RPM packages alongside x86_64 through the Waterfox package repositories, now hosted under `isv:BrowserWorks`.
  • Adds a redesigned About dialog built on the Waterfox design.
  • Enables the global menu bar on Linux desktops that provide one, including on Wayland.
  • Lets the disk cache's in-memory layer grow with available RAM instead of stopping at a fixed ceiling.
  • Fixes opening links in a new private tab from the context menu.
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6.6.17 Security and regional search follow-up

Desktop

Includes fixes from the forthcoming MFSA 2026-70, attempts to correct regional search defaults, and adds a privacy-enhancing search suggestion proxy alongside compatibility fixes.

  • Includes security fixes covered by the forthcoming Mozilla Foundation Security Advisory 2026-70.
  • Attempts to correct the previous country based search configuration, using Qwant in supported regions and DuckDuckGo elsewhere.
  • Migrates users affected by earlier automatically selected defaults to the appropriate regional search engine.
  • Removes obsolete search overrides that could interfere with regional defaults and Waterfox search attribution.
  • Routes Google-backed search suggestion requests through Waterfox Private Search to prevent a direct connection to Google.
  • Stops forcing the experimental HTTP `Idempotency-Key` header on POST requests.
  • Fixes Chase compatibility when Waterfox's built-in content blocker is enabled.
  • Highlights Waterfox 6.7.0-beta.2 and invites users to help test and report regressions.
View full notes

6.7.0-beta.2 Legacy extensions and Tree Tabs improvements

Desktop
Beta

Second 6.7.0 beta adding initial support for restartless legacy extensions and prerelease Linux packages, alongside extensive Tree Tabs, compatibility, and palette fixes.

  • Adds initial support for restartless legacy extensions using `install.rdf`, `bootstrap.js`, and compatible `chrome.manifest` entries.
  • Enables publication of prerelease x86_64 DEB and RPM packages through the Waterfox OBS repositories.
  • Significantly improves Tree Tabs session restoration, ordering, tree operations, and cross-window tab movement.
  • Updates Qwant's regional availability, search parameters, and branding.
  • Stops automatically enforcing soft-blocked add-ons while retaining hard-block protections, including for unsigned legacy extensions.
  • Disables automatic generation of HTTP `Idempotency-Key` headers by default.
  • Fixes Chase compatibility when the built-in content blocker is enabled.
  • Prevents selected Waterfox colour palettes from being overwritten by later default-theme updates.
View full notes

1.2.6 Gecko 153 and search updates

Android

Gecko 153, regional search availability updates, and Qwant AI Answers disabled by default

  • Upgraded the browser engine to Gecko 153, bringing in the latest upstream fixes and improvements.
  • Replaced Qwant with DuckDuckGo in regions where Qwant is not supported.
  • Ensured Qwant's 'AI Answers' feature is disabled by default when Qwant is selected.
View full notes

6.6.16 Qwant becomes the default search engine

Desktop

Qwant is now the default search engine, the 6.6.16.1 hotfix corrects default-region and query handling issues, and security fixes shipped ahead of the next ESR 140 release.

  • Waterfox 6.6.16.1 corrects Qwant defaults in unsupported regions, requests AI answers off by default, and fixes locale-country query handling for values such as `es_US`.
  • Fixed multiple security vulnerabilities, including all fixes landed to date for the upcoming Firefox ESR 140.13, shipped ahead of Mozilla's release schedule.
  • Qwant is now the default search engine in 26 regions, with DuckDuckGo as the default everywhere else, replacing 1.org.
  • If you've set your own search engine, your choice is respected and nothing changes.
  • The built-in ad blocker's search ads allowance now follows the new default to Qwant.
  • Waterfox 6.7.0-beta.1 is now available for testing.
View full notes

6.7.0-beta.1 Supernova

Desktop
Beta

First 6.7.0 beta moving Waterfox to the ESR 153 platform, with tree tabs built natively into vertical tabs, a new Nova style and colour system, ad blocker improvements, and a reworked first-run setup.

  • Upgrades the underlying platform from ESR 140 to ESR 153, rolling up a year of upstream engine, performance, and security work.
  • Rebuilds tree-style tabs as a native part of the vertical tab strip, replacing the bundled Tree Style Tab fork from 6.6.
  • Adds Nova, a new browser style alongside Proton and Photon, plus twelve colour palettes, each with light and dark variants.
  • Moves the built-in ad blocker to its own Settings pane, injects anti-adblock scriptlets before page scripts run, and grows the redirect resource list from 17 to 62.
  • Changes the default search engine to Qwant in 26 regions and DuckDuckGo elsewhere, replacing 1.org as the global default.
  • Rebuilds first-run setup and the Firefox profile migrator, and adds native messaging support for companion apps on macOS and Linux.
  • Resumes network updates for certificate revocation data (OneCRL, CRLite) and the add-on blocklist, and adds Settings controls for Ultra Protection.
  • Adds ARM64 builds for every platform, including the Debian and RPM packages on Linux.
View full notes

1.2.5 Gecko 152 update

Android

Gecko 152, security updates and search provider changes

  • Upgraded the browser engine to Gecko 152, bringing in the latest upstream fixes and improvements
  • Includes security fixes from MFSA 2026-62, MFSA 2026-57
  • Qwant is now the default search
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6.6.15 Security follow-up release

Desktop

A follow-up security release for Mozilla Foundation Security Advisory 2026-58, covering the remaining fixes not already included in Waterfox 6.6.14.

  • Fixed the remaining security issues relevant to Waterfox from Mozilla Foundation Security Advisory 2026-58.
  • Most fixes associated with this advisory were already included in Waterfox 6.6.14; this release completes the remaining follow-up work.
  • A beta release for the next major Waterfox version will be available soon.
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6.6.14 Web compatibility and ad blocker refinements

Desktop

Compatibility improvements for Discord and Chase, a macOS crash workaround, and reliability improvements for the built-in ad blocker.

  • Attempted user agent compatibility improvements for Discord.
  • Attempted user agent compatibility improvements for Chase bank.
  • Worked around a macOS 26.5 issue that could cause Waterfox to crash.
  • Added a site information panel toggle to always allow cookies and site data for the current site.
  • Improved built-in ad blocker reliability with modern filter lists and site specific rules.
  • Reduced the chance of ads or annoyances briefly appearing on pages loaded immediately after startup.
  • Reduced background work performed by the blocker when a page starts loading.
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1.2.4 Gecko 151 update

Android

Gecko 151, security updates, search provider changes, What's New menu behavior, and custom wallpaper improvements

  • Upgraded the browser engine to Gecko 151, bringing in the latest upstream fixes and improvements.
  • Includes security fixes from MFSA 2026-46.
  • Removed Startpage as a search option at Startpage's request; Yahoo is currently set as the default search engine.
  • Fixed the What's New menu item so it stays hidden after reading release notes until the next release.
  • Improved custom wallpaper handling.
View full notes

6.6.13 Default ad blocker & search updates

Desktop

Security fixes, the built-in ad blocker now enabled by default, a new temporary default search engine, and several web compatibility improvements.

  • Fixed multiple security vulnerabilities as described in Mozilla Foundation Security Advisory 2026-48.
  • The built-in ad blocker is now enabled by default.
  • Fixed tracking protection not blocking properly due to missing bundled assets.
  • Startpage has been removed as a search provider, with 1.org set as the temporary default.
  • Waterfox Private Search is now $5/month for unmetered, ad free searches.
  • Internationalised domain names are now displayed as unicode instead of punycode for better legibility.
  • CSS dithering is now enabled, reducing colour banding on gradients.
  • Attempted compatibility improvements for websites such as LinkedIn.
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1.2.3 Gecko 150 update

Android

Gecko 150 and a note on classic menu style requests

  • Upgraded the browser engine to Gecko 150, bringing in the latest upstream fixes and improvements.
  • Acknowledged community requests for a classic menu style, investigating how best to implement it.
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6.6.12 Security fixes and ad blocker improvements

Desktop

Security fixes and major improvements to the built-in ad blocker in preview testing.

  • Fixed multiple security vulnerabilities as described in Mozilla Foundation Security Advisory 2026-32.
  • Added a Custom Filter Lists manager so you can add and remove your own filter list URLs from the UI.
  • Improved the Filter Lists screen with search, manual refresh, configurable refresh intervals, and per list status information.
  • Smarter blocker update logic with per list refresh handling, caching, and better error handling.
  • Better cosmetic filtering on web pages.
  • Stricter detection of conflicting ad blocker extensions to reduce false positives.
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6.6.11 Security fixes and feature preview

Desktop

This release includes the latest security fixes and a built-in ad blocker available for testing

  • Security fixes from upcoming Gecko 140.10 ESR
  • Built-in ad blocker available for early testing
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6.6.10 Discord compatibility and security fixes

Desktop

Security fixes and a Discord compatibility fix.

  • Fixed multiple security vulnerabilities as described in Mozilla Foundation Security Advisory 2026-22.
  • Backported a fix to resolve a requirement for Discord voice and video compatibility.
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1.2.2 Stability and cleanup

Android

Gecko 149 and a fix for deleting data on quit

  • Upgraded the browser engine to Gecko 149, bringing in the latest upstream fixes and improvements.
  • Fixed an issue where the 'Quit' button wouldn't delete your data when 'Delete browsing data on quit' was enabled.
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1.2.1 Stability and cleanup

Android

Gecko 148.0.3 and a fix for deleting data on quit

  • Upgraded the browser engine to Gecko 148.0.3, bringing in the latest upstream fixes and improvements.
  • Fixed an issue where the 'Quit' button wouldn't delete your data when 'Delete browsing data on quit' was enabled.
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6.6.9 Security and stability improvements

Desktop

Security fixes, certificate reliability improvements, and JPEG-XL performance gains.

  • Fixed multiple security vulnerabilities as described in Mozilla Foundation Security Advisory 2026-15.
  • Fixed 3 CVEs in the JPEG-XL image decoder.
  • Fixed an issue that could cause 'Unknown Issuer' certificate errors on certain sites, most commonly on Linux.
  • Small performance improvement in JPEG-XL image decoding.
  • Ogg Theora support can be experimentally re-enabled.
  • Printer driver isolation on Windows for improved stability.
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1.2.0 A stronger foundation

Android

Less deps, and expanded theme customisation

  • Updated base from Gecko 140 to 148, bringing in newer browser improvements and fixes.
  • Enabled GeckoView Lite which trims out extra built in components the app doesn't need, which keeps the app smaller and reduces background overhead.
  • Implemented a dummy version of Mozilla's Glean telemetry SDK and fully removed the Adjust SDK.
  • Improved themes customisation is now under Settings > Customize, with separate light and dark colors and an option to match your device theme automatically.
View full notes

1.1.9 Security fixes

Android

Fixes for various security issues

  • (MFSA 2026-03) Security Vulnerabilities fixed in Firefox ESR 140.7
  • (MFSA 2025-94) Security Vulnerabilities fixed in Firefox ESR 140.6
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6.6.8 Tab unloading & passkeys

Desktop

Manual tab unloading with improved unloaded tab previews, macOS passkeys, Windows redist bundling, and assorted import/UI fixes.

  • Manually unload tabs from the tab context menu, with improved unloaded tab previews.
  • Web Authentication (passkeys) support on macOS.
  • Windows builds now bundle the required Visual Studio redistributables for easier fresh installs.
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6.6.7 Import & Linux video fixes

Desktop

Fixes Windows Firefox import issues, resolves Linux HDR playback problems, and ships a verified Flathub Flatpak.

  • Fixed issue importing Firefox data on Windows (Settings > Import browser data).
  • Fixed an issue on Linux where HDR would be broken on YouTube videos.
  • Linux has now been verified on Flathub, so you can trust the provenance of it.
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1.1.8 Security fixes

Android

Fixes for various security issues

  • (MFSA 2025-94) Security Vulnerabilities fixed in Firefox ESR 140.6
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6.6.6 Privacy hardening

Desktop

Explicitly disables some settings and fixes some feature implementations.

  • Explicitly disables network-based region and geo-IP lookups, fixing region to a non-dynamic value.
  • Turns off the local ML/AI runtime, AI link previews and related Labs plumbing so they can’t re-enable themselves from old Firefox profiles.
  • Translations remain available, and fixes Private Tab search and status bar Bookmarks widget behaviour."
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6.6.5.1 Startpage default search and Tree Vertical Tabs fix

Desktop

Small 6.6.5.1 patch that switches the default search back to Startpage and fixes Tree Vertical Tabs behaviour and options visibility.

  • Switches the default search engine back to Startpage, without affecting users who have already changed their default.
  • Fixes Tree Vertical Tabs continuing to run in the background when disabled, so turning it off actually unloads the feature and can reduce memory usage.
  • Fixes Tree Vertical Tabs options appearing at the bottom of Preferences/Settings → General on first load so they now only appear under the dedicated Tree Vertical Tabs category.
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1.1.7 Startup crash fixes

Android

Android 1.1.7 fixes crashes and ANR issues on startup for certain devices.

  • Fixes crashes and ANR issues during startup on certain Android devices.
  • Improves overall stability at application launch.
View full notes

1.1.6 Search defaults and security update

Android

Updates search defaults on Android and brings in the latest security fixes from Mozilla Foundation Security Advisory 2025-88.

  • Changes the default search engine back to Startpage for users who have not customised their default.
  • Includes all security fixes from Mozilla Foundation Security Advisory 2025-88.
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6.6.5 Ukrainian locale and quick URL copy

Desktop

Adds a Ukrainian UI locale, a quick shortcut to copy the current tab URL, and the latest security fixes for Waterfox 6.6.5.

  • Adds Ukrainian as a UI language.
  • Introduces a keyboard shortcut to quickly copy the current tab URL on macOS (Command+Shift+U) and Windows/Linux (Ctrl+Shift+U).
  • Includes the latest security advisories from MFSA 2025-89.
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1.1.5 Ecosia partnership and search fixes

Android

Android release that renews the Ecosia search partnership, fixes Mojeek search queries, and pulls in the latest security and stability fixes.

  • Renews the Ecosia search partnership on Android with a focus on climate-positive, privacy-friendly search.
  • Keeps existing non-Ecosia default search choices unchanged while offering Ecosia as an improved default.
  • Fixes malformed search queries when using Mojeek.
  • Updates to GeckoView ESR 140.4 and Android Components 140.4 for upstream security and stability fixes.
View full notes

6.6.4 Ecosia partnership, Waterfox Private Search, and search fixes

Desktop

Waterfox 6.6.4 restores canonical app naming on Linux, renews the Ecosia partnership, adds Waterfox Private Search, adjusts tab grouping defaults, and fixes several search provider and security issues.

  • Renews the Ecosia partnership and makes Ecosia the default search engine again.
  • Introduces Waterfox Private Search as an optional subscription-based, ad-free search provider.
  • Fixes Mojeek search queries and restores Google search autocomplete when set as default.
  • Applies all security advisories from Mozilla MFSA 2025-83.
  • Restores the Linux app name and window class to 'waterfox' for better desktop integration.
  • Disables automatic tab grouping by default due to a group-merging issue, with a preference to re-enable it.
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6.6.3 Theming polish and tab group refinements

Desktop

Polish-focused 6.6.3 update that fixes theme style leakage, improves contrast, refines tab group behavior, and updates emoji support.

  • Fixes a long-standing issue where Waterfox interface styles could bleed into website content.
  • Improves theme colouring to avoid contrast issues and enables the active tab context line by default.
  • Refines tab group behavior at startup and when collapsing the only group, keeping layout stable.
  • Updates emoji rendering to Emoji 16.0.1 on platforms without native support.
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1.1.4 OLED black theme

Android

Android 1.1.4 adds a black theme optimized for OLED devices and updates core libraries for the latest security and performance fixes.

  • Adds a Black theme specifically designed for OLED displays.
  • Updates to the latest development libraries for improved security and performance.
View full notes

6.6.2 Theme refinements, Windows Mica/Acrylic, and tab group improvements

Desktop

Waterfox 6.6.2 polishes the theme, refines vertical tabs and Windows translucency, and improves tab grouping behavior while restoring recent history and top sites in the address bar.

  • Refines the default Waterfox UI theme, including restoring tab shapes and improving contrast between active/inactive tabs and the navigation bar.
  • Adds Windows 11 Mica-style translucency with optional stronger Acrylic effects via about:config.
  • Improves tab grouping behavior so new tabs stay in the correct group, collapsing the only group works intuitively, and the cancel auto-grouping shortcut behaves reliably.
  • Makes auto-grouping more resilient by cleaning up timers and listeners and handling edge cases across windows.
  • Restores recent history and top sites in the address bar and fixes middle-click paste behavior on Linux.
  • Begins addressing a long-standing issue where some users saw an empty or hidden profile after updating.
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6.6.1 WebGPU enablement and private tab improvements

Desktop

Patch release that enables WebGPU on stable builds, fixes several Linux and Windows UI issues, and adds new privacy and control options for Private Tabs.

  • Enables WebGPU on release channel builds by removing code that previously blocked it.
  • Restores Unity global menu support on Linux and fixes issues with the Restart command and its alignment on Linux and Windows.
  • Fixes the missing Install update option in about:addons when automatic updates are disabled.
  • Disables captive portal detection so the operating system handles it, removing an extra network request to Mozilla.
  • Reorganizes Waterfox language strings and restores missing Tree Vertical Tabs labels.
  • Adds a preference to control the New Private Tab button and tightens privacy for Private Tabs by disabling suggestions and not saving search terms.
View full notes

6.6.0 Major ESR 140 upgrade with vertical tabs, tab groups, and new tab experience

Desktop

Waterfox 6.6.0 upgrades the underlying platform from ESR 128 to 140 and introduces first-party vertical tabs, private tabs, tab grouping, new tab wallpapers, expanded media and hardware acceleration, and privacy-friendly defaults.

  • Upgrades the underlying platform from ESR 128 to ESR 140, rolling up twelve months of upstream changes.
  • Adds first-party vertical tabs with optional tree-style layout and a quick New Private Tab button.
  • Introduces automatic tab grouping, customizable placement, and a redesigned new tab page with wallpapers, search bar, and optional weather.
  • Enables Firefox profile import for bookmarks, history, cookies, form data, and passwords.
  • Turns on WebGPU, Web Share API, VP8/VP9 hardware acceleration for WebRTC, improved MathML rendering, and other modern platform features.
  • Refines the UI with layout and theming options, status bar, compact density, and platform-specific polish on Windows and macOS.
  • Tightens privacy defaults by reducing promos, speculative connections, remote config fetches, and bundled A/B testing code.
View full notes

1.1.3 JPEG-XL animations and theme stability

Android

Adds support for animated and alpha-transparent JPEG-XL images and fixes crashes when using custom themes on Android.

  • Adds support for JPEG-XL images with animations and alpha transparency on Android.
  • Fixes experimental crashes when a custom theme is selected due to missing colour definitions.
View full notes

6.6.0 Beta 6 Theming and stability fixes before 6.6.0 final

Desktop
Beta

Final 6.6.0 beta that polishes theming and fixes crashes caused by optimization flags on some systems.

  • Fixes various small theming issues introduced in earlier 6.6 betas.
  • Resolves crashes on certain systems caused by aggressive optimization flags.
View full notes

1.1.2 Experimental themes, wallpapers, and x86_64 support

Android

Adds experimental theme and wallpaper support on Android and reintroduces support for x86_64 Android devices.

  • Adds experimental theme support so users can try alternate UI themes.
  • Introduces experimental custom wallpapers to personalize the app background.
  • Reintroduces support for x86_64 Android devices.
View full notes

6.6.0 Beta 5 Private tab button and privacy fixes

Desktop
Beta

Fifth 6.6.0 beta adding an easily accessible New Private Tab button and fixing private tab history, translation model downloads, password autofill, and the screenshot tool.

  • Adds a clearly visible New Private Tab button next to the New Tab button.
  • Ensures Private Tabs no longer retain browsing history.
  • Fixes translation model downloads so language packs are no longer blocked.
  • Restores password autofill behavior.
  • Returns the screenshot tool to the context menu.
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6.6.0 Beta 4 Onboarding and new tab personalization

Desktop
Beta

Fourth 6.6.0 beta reintroducing the about:welcome setup experience and adds search, weather, and wallpaper customization to the new tab page.

  • Brings back the about:welcome onboarding flow for new or reset profiles.
  • Adds a toggle to show or hide a search bar on the new tab page.
  • Adds an optional weather widget for your location on the new tab page (opt-in, requires sending your IP to Mozilla).
  • Lets you set custom new tab wallpapers using your own image, predefined colors, or a custom color.
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6.5.11 Final ESR 128 security update

Desktop

Final 6.5.x release on ESR 128 delivering the latest security fixes before the move to ESR 140 in Waterfox 6.6.

  • Includes the latest security fixes (MFSA 2025-58).
  • Marks the final Waterfox release based on ESR 128 before moving to ESR 140 in the 6.6 release series.
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1.1.1 DuckDuckGo fix and menu improvements

Android

Android release that fixes the DuckDuckGo default search engine bug and adds a Quit button plus a menu redesign toggle.

  • Fixes an issue where DuckDuckGo could not be set correctly as the default search engine.
  • Adds a Quit button to the main menu for easier app exit.
  • Introduces a toggle to switch between the new menu design and the classic layout.
View full notes

6.6.0 Beta 3 macOS auto-update fix and logo, privacy, and classic extensions tweaks

Desktop
Beta

Third 6.6.0 beta that fixes a macOS auto-update bug, refreshes the liquid glass logo, tightens speculative connections and remote config behavior, and restores classic extension compatibility.

  • Fixes a macOS auto-update bug in earlier beta builds by requiring a one-time manual reinstall and cache cleanup.
  • Updates the Waterfox logo and dock icon on macOS 26 and standardizes icons across platforms.
  • Disables speculative connections when typing in the address bar and uses bundled offline copies of remote settings instead of contacting Mozilla.
  • Removes packaged A/B testing code that was already disabled.
  • Fixes duplicate tab creation when opening a duplicate and restores compatibility with classic-style extensions such as TabMixPlus.
View full notes

1.1.0 ESR-based rebuild of Waterfox for Android

Android

Major rebuild of Waterfox for Android on the ESR codebase with everything compiled from source for better stability, performance, and privacy-friendly defaults.

  • Rebuilds Waterfox for Android on the ESR codebase with Android Components, Gecko, and SpiderMonkey compiled from scratch.
  • Removes telemetry, sponsored content, experimentation frameworks, and tracking services in favour of strict privacy defaults.
  • Adds advanced privacy features such as enhanced DNS over HTTPS with Ultra Protection (Oblivious HTTP) and full about:config access.
  • Greatly expands add-on support: browse and install from the full Mozilla Add-ons store, use Android-only views, custom AMO collections, and install .xpi files.
  • Updates search and navigation with privacy-focused engines, Waterfox-specific top sites, and JPEG-XL support.
  • Simplifies the app by removing unnecessary integrations and preparing new distribution channels like GitHub APKs and alternative app stores.
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6.6.0 Beta 2 Tree vertical tabs and automatic tab grouping

Desktop
Beta

Second 6.6.0 beta focusing on tree-style vertical tabs, automatic tab grouping, and Firefox profile import on the ESR 140 platform.

  • Introduces tree-style vertical tabs in the vertical tab sidebar.
  • Adds automatic tab grouping with configurable placement, delay, and a cancel shortcut.
  • Allows importing bookmarks, history, cookies, form history, and passwords directly from a Firefox profile.
  • Exposes fine-grained control over auto-grouping behavior via about:config preferences.
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6.5.10 Security fixes and Startpage default search

Desktop

Patch release that includes the latest security fixes and temporarily switches the default search engine to Startpage while Bing syndication is being retired.

  • Includes the latest security fixes from Mozilla's MFSA 2025-53 advisory.
  • Temporarily switches the default search engine to Startpage while Bing search syndication and APIs are discontinued.
  • Highlights the availability of Waterfox 6.6.0 Beta 1 for testing on ESR 140.
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6.6.0 Beta 1 ESR 140 beta: platform upgrade and modern web features

Desktop
Beta

First 6.6.0 beta upgrading Waterfox to the ESR 140 platform with WebGPU, modern CSS/DOM/SVG features, improved media and WebRTC, and UI/network/privacy refinements.

  • Upgrades the underlying platform from version 128.0 to 140.0 for beta testing.
  • Enables experimental web platform features including CSS Masonry layout, new CSS and SVG capabilities, and modern DOM APIs such as CloseWatcher and screen orientation lock.
  • Improves media and graphics with WebGPU, VP8/VP9 hardware acceleration for WebRTC, MathML updates, and enhanced autoplay controls.
  • Refines UI defaults such as smooth scrolling, updated Proton colors, and layout and bookmark tweaks.
  • Introduces network and cookie handling improvements like CHIPS, SameSite enhancements, and HTTP/3-related optimizations.
  • Reduces promotions and tightens extension and privacy behavior in line with upstream platform changes.
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6.5.8 Security update and media crash hotfix

Desktop

Security-focused 6.5.8 release with the latest upstream fixes, a short-lived media crash issue resolved in 6.5.9, and continued promotion of the Waterfox Private Search open beta.

  • Includes the latest security fixes from Mozilla advisories MFSA 2025-37 and MFSA 2025-43.
  • Documents a temporary crash affecting certain media-heavy sites, resolved in follow-up release 6.5.9.
  • Continues the open beta promotion of Waterfox Private Search as a more private, ad-light search option.
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6.5.9 Security fixes and media crash patch

Desktop

Patch release that addresses media playback crashes and includes the latest upstream security fixes, while continuing the Waterfox Private Search open beta.

  • Includes the latest security fixes from MFSA 2025-37 and MFSA 2025-44.
  • Fixes crashes when playing certain media files.
  • Highlights the ongoing open beta for Waterfox Private Search.
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6.5.7 Vertical tabs improvements and security fixes

Desktop

Patch release focusing on vertical tabs polish, stability, and the latest security updates, plus an open beta of Waterfox Private Search.

  • Includes the latest security fixes (MFSA 2025-29).
  • Improves vertical tabs favicon handling, bookmarks sidebar and library integration, popup menus, tab previews, private window stability, and drag-and-drop behavior.
  • Announces the open beta of Waterfox Private Search, a privacy-focused meta-search engine.
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6.5.6 JPEG-XL security fixes and WASM sandbox restoration

Desktop

Patch release that updates JPEG-XL to address security issues, restores WASM sandboxed libraries, and includes the latest security fixes.

  • Updated the JPEG-XL library to resolve reported security issues.
  • Re-enabled WASM sandboxed libraries after fixing underlying build issues.
  • Includes the latest upstream security fixes (MFSA 2025-17).
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6.5.5 Restart button and status bar fixes

Desktop

Patch release that restores the Restart button on Linux and Windows, cleans up the status bar text, and includes the latest security updates.

  • Includes the latest security fixes from Mozilla (MFSA 2025-13).
  • Restores the Restart button on Linux and Windows.
  • Removes the unexpected `(NULL)` label from the status bar text on Linux and Windows.
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6.5.4 Security update for 6.5.4

Desktop

This patch release delivers the latest upstream security fixes for Waterfox 6.5.4 and documents the remaining known issue with the Restart button on Linux and Windows.

  • Includes the latest security fixes from Mozilla's MFSA 2025-09 advisory.
  • Restart button remains missing on Linux and Windows (known issue).
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6.5.3 Stability and theming fixes

Desktop

Maintenance release with theming polish, configuration clean-up, and the latest security updates.

  • Polished various theming issues.
  • Updated base configuration defaults and removed unused values.
  • Includes the latest security fixes (MFSA 2025-02).
  • Restart button remains missing on Linux and Windows.
  • Some users may still experience session restore issues (Bug 1901899).
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6.5.2 Theming, vertical tabs, and security fixes

Desktop

Patch release focusing on theming improvements, vertical tab stability, and the latest security updates.

  • Fixes various theming issues across the browser UI.
  • Resolves multiple problems with vertical tabs.
  • Includes the latest upstream security fixes (MFSA 2024-64).
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6.5.1 JPEG-XL stability and Look & Feel fixes

Desktop

Bugfix release that updates the JPEG-XL library to prevent crashes and restores missing Look & Feel strings.

  • Updated the JPEG-XL library to the latest version to stop crashes on sites serving .jxl images.
  • Restored missing strings on the Look & Feel preferences page so theme settings can be changed again.
  • Known issues remain: missing Restart button on Linux/Windows, status bar colour mismatches, and occasional session restore problems.
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6.5.0 ESR 128 stable and architecture overhaul

Desktop

First stable Waterfox 6.5 release on the ESR 128 branch with updated system requirements, performance tuning, and classic tools like the legacy password and config managers.

  • First stable release of the ESR 128 branch (6.5.x) with updated versioning and dropping the 'G' prefix
  • Raised minimum system requirements to match modern Windows 10-era hardware (SSE3-class CPUs)
  • Retuned CPU code generation for Skylake-class and newer processors for better performance
  • Added a Table of Contents to the Preferences page for easier navigation
  • Reintroduced the classic password manager and configuration manager
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6.5.0 Beta 3 CPU compatibility, security patches, and DRM fixes

Desktop
Beta

Third 6.5.0 beta improving compatibility with older CPUs, applying security patches, and fixing DRM playback on macOS.

  • Improves compatibility with older CPUs.
  • Includes additional security patches for this beta.
  • Fixes DRM playback on macOS.
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6.5.0 Beta 2 Fixes for vertical tabs and default browser issues

Desktop
Beta

Second 6.5.0 beta focusing on fixing the initial round of vertical tab bugs and default browser handling on Windows.

  • Fixes setting Waterfox as the default browser on Windows.
  • Corrects vertical tabs autohide behavior in F11 fullscreen.
  • Resolves errors and missing functionality in the vertical tabs options page and sidebar menu.
  • Restores tab preview and F1 toggling behavior for Waterfox vertical tabs.
  • Fixes toolbar customisation issues that could remove the vertical tabs button.
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6.5.0 Beta 1 ESR 128 beta and architecture overhaul

Desktop
Beta

First Waterfox 6.5.0 beta on the ESR 128 branch with updated system requirements, performance tuning, and classic tools returning.

  • First beta release on the ESR 128 branch (6.5.x) and dropping the 'G' prefix from version numbers.
  • Raises minimum system requirements to match modern Windows 10-era hardware (SSE3-class CPUs).
  • Retunes CPU code generation for Skylake-class and newer processors for improved performance.
  • Adds a Table of Contents to the Preferences page for easier navigation.
  • Allows setting any URL as the new tab page via the browser.newtab.url preference in about:config.
  • Reintroduces the classic password manager implementation.
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