Waterfox 6.6.17 includes security fixes from the forthcoming MFSA 2026-70, attempts to correct the previous regional search configuration, and includes compatibility fixes also shipping in the 6.7 beta.
Security
Waterfox 6.6.17 includes the fixes covered by Mozilla Foundation Security Advisory 2026-70.
Changed
- Updated the country based search configuration:
- Qwant is used in supported regions.
- DuckDuckGo is used elsewhere.
- Qwant remains the fallback while the region is unknown.
- Migrated users from the former 1.org default, and from other defaults selected automatically by previous configurations, to the appropriate regional default. 1.org is still available as an option, but due to a bug there was no way to separate users who selected 1.org as the default, vs those who have just been following the default.
- Removed obsolete search overrides that could interfere with regional defaults or suppress Waterfox search attribution parameters. Built-in content blocker conflict handling remains unchanged.
- Stopped forcing the experimental HTTP
Idempotency-Keyheader on POST requests.
Privacy
- Search suggestion requests that would otherwise go to Google are now proxied through Waterfox Private Search. This prevents a direct connection between your browser and Google, keeping your IP address and request metadata from being sent to Google directly.
Fixed
- (Attempted) Fixed Chase website compatibility when Waterfox's built-in content blocker is enabled.
Support Waterfox in 3 different ways
If you would like to support Waterfox's continued development, you can do so through either of the project's search options or by helping test upcoming releases.
1. Use Qwant and allow search ads
If Qwant is supported in your region, make it your default search engine and consider allowing ads on Qwant search pages. Waterfox's built-in content blocker allows search ads on Qwant by default. If you use another ad blocker, please consider allowlisting Qwant.
Search revenue from Qwant helps fund Waterfox at no cost to you, while Qwant does not track or profile its users. Learn more about the Waterfox and Qwant partnership.
2. Subscribe to Waterfox Private Search
Waterfox Private Search has received a fresh lick of paint. It offers an ad-free search experience through a subscription that directly supports Waterfox's development while keeping privacy at its core.
3. Test Waterfox Beta
Waterfox 6.7.0-beta.2 is available now. Testing the beta on your usual websites and workflows, then reporting anything you find, helps catch regressions before they reach the stable channel.
Visit the download page, select the Beta channel, and choose the build for your platform.