Quote:Waterfox 6.6.10

6.6.10- Discord compatibility and security fixes​

Security​

• Fixed multiple security vulnerabilities as described in Mozilla Foundation Security Advisory 2026-22.
  

Changes​

• Backported the fix for Bug 1969603, resolving a recursive deadlock in RTCRtpScriptTransform. This fix is needed for Discord and should restore voice and video functionality.
  
• Added a Discord specific user agent override that reports Waterfox as Firefox 149, which should help keep Discord voice and video working correctly.
  

6.6.10 - Discord compatibility and security fixes - Waterfox Release 

Release 6.6.10 · BrowserWorks/waterfox

Quote:Waterfox 6.6.11

6.6.11- Built-in ad blocker preview and security fixes​

Security​

• The latest security and bug fixes (at the time of this release) have been pulled in from the upcoming Gecko 140.10 ESR release, which will be generally available in two weeks’ time.
  

Changes​

• Waterfox now has a built-in ad blocker that will be enabled by default in an upcoming release. It’s available for early testing in this build, you can find out how to enable it and submit feedback here: Native Ad Blocker - Feedback · Issue #4182 · BrowserWorks/waterfox
  

6.6.11 - Built-in ad blocker preview and security fixes - Waterfox Release

Quote:Waterfox 6.6.12

6.6.12- Security fixes and ad blocker improvements​ Security​

• Fixed multiple security vulnerabilities as described in Mozilla Foundation Security Advisory 2026-32.
  

Ad Blocker (preview)​

The built-in ad blocker introduced in 6.6.11 has received a few improvements in this release. It remains in preview testing - you can follow the feedback issue at Native Ad Blocker - Feedback · Issue #4182.

Custom Filter Lists manager

​A new dialog lets you add and remove your own filter list URLs directly from the UI, rather than being limited to the built-in lists. A new button has been added to the blocker preferences to open the manager.

Filter Lists screen improvements​

The existing Filter Lists screen has received major updates:

• Search box to quickly find lists
  
• “Refresh now” button for manual updates
  
• Refresh interval dropdown (4h, 8h, 12h, 24h, 7d, or default)
  
• Per list “last updated / next refresh” information
  
• Source link icon for each list
  

 Less wasteful update logic​

• Each list’s own Expires value is now respected, instead of a fixed 12h interval applied to all lists
  
• Configurable refresh interval
  
• Manual refresh method exposed to the UI
  
• Better error handling when loading the engine cache
  
• Safer input sanitization before data is passed to the engine
  
• Network observers are registered and unregistered based on blocker state
  

Better cosmetic filtering​

• Early check for whether the blocker is enabled
  
• Cosmetic CSS injection now only runs on HTML pages, avoiding breakage on XML or text content
  
• Hard cap on queried DOM elements to prevent runaway processing
  
• Uses CSS rule insertion instead of rebuilding the full style text
  

Stricter extension detection​

Conflicting ad blocker extensions are now identified only by known extension IDs. Pattern matching on extension name and description has been removed, reducing false positives from unrelated extensions.

6.6.12 - Security fixes and ad blocker improvements - Waterfox Release   

Release 6.6.12 · BrowserWorks/waterfox

Quote:Waterfox 6.6.13

6.6.13- Default ad blocker & search updates​Bug Fixes​

• Tracking protection assets: Fixed an issue where tracking protection wasn’t blocking things properly because the required assets weren’t being bundled with the browser.
  

Web Compatibility​

• IDN unicode display: Internationalised domain names are now handled and displayed by the browser as unicode, instead of always being shown as punycode. This provides better legibility for users who visit websites with non-latin characters.
  
• CSS dithering: Dithering is now enabled for CSS rendering, which should eliminate visible colour banding on gradients.
  
• LinkedIn and others: Attempted compatibility improvements with sites such as LinkedIn that were not rendering correctly.
  

Ad Blocker​

The built-in ad blocker is now enabled by default! After several rounds of preview testing across 6.6.11 and 6.6.12, the blocker is ready for general use - giving you high performance ad blocking out of the box while supporting Waterfox at the same time.

If you are already using another ad blocker, don’t worry - it will continue to work instead of the built-in one. But please consider giving the built-in blocker a try, as it’s a great way to support Waterfox.

You can follow the feedback issue at Native Ad Blocker - Feedback · Issue #4182.

6.6.13 - Default ad blocker & search updates - Waterfox Release   Release 6.6.13 · BrowserWorks/waterfox

Quote:Waterfox 6.6.14

6.6.14- Web compatibility and ad blocker refinements​Web Compatibility​Attempted compatibility improvements for Chase and Discord by adjusting how Waterfox presents itself to the site.

These changes are compatibility workarounds rather than fixes for a technical limitation in Waterfox. Some sites appear to rely on user agent checks to decide whether a browser is supported, so Waterfox now makes a better effort to identify itself in a way those checks will accept. There is no guarantee these fixes will work, but I have not found a technical reason why these websites would not work that hasn’t already been implemented in Waterfox.
 macOS​

• Worked around a bug introduced in macOS 26.5 that could cause Waterfox, as well as any Gecko based browser, to crash.
  

Site Data​

• Added a new Always store cookies/data for this site toggle to the site information panel. This gives you a quick way to let a trusted site keep its cookies and site data, which can help when a site keeps forgetting logins, preferences, or other saved state because of stricter cookie settings. Thanks to Defelo for the PR, and to LibreWolf for developing the original patch.
  

Ad Blocker​The built-in blocker has received another round of reliability and performance improvements:

• Modern filter lists should now be handled more reliably.
  
• Some site specific ad-blocking fixes should now be picked up correctly instead of being ignored or misread.
  
• Pages loaded immediately after opening Waterfox should be less likely to briefly show ads or annoyances before the blocker catches up.
  
• The blocker now does a little less background work when a page starts loading.
  

This will hopefully enable greater compatibility with websites like YouTube, working around their anti-adblock messages.

6.6.14 - Web compatibility and ad blocker refinements - Waterfox Release