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Desktop
June 2, 2026

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.