Download Latest Version 6.6.10 source code.tar.gz (923.2 MB)
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6.6.9 source code.tar.gz 2026-02-24 922.5 MB
6.6.9 source code.zip 2026-02-24 1.2 GB
README.md 2026-02-24 910 Bytes
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Waterfox 6.6.9 includes security updates, a certificate reliability fix, and a minor performance improvement.

Security

Bug Fixes

  • Certificate reliability improvements: Fixed an issue that could cause "Unknown Issuer" certificate errors on certain sites, most commonly on Linux. Waterfox now refreshes intermediate certificate data as needed to keep HTTPS sites loading securely. No new browsing data is collected; Waterfox may contact Mozilla's certificate update endpoints to fetch missing intermediate certificates and revocation data.

Performance

  • Small performance improvement in JPEG-XL image decoding (improved LUT loading and added RGB offset dithering).
Source: README.md, updated 2026-02-24