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Waterfox vs Firefox ESR: catalog facts
Waterfox	Firefox ESR
Free Free and open source under MPL-2.0. Development is funded by donations.	Free Free and open source; Mozilla offers optional paid professional support for organisations.
Windows, macOS, Linux	Windows, macOS, Linux
Telemetry and data collection are removed from the build, not just disabled in preferences Ad blocking and private, anonymised DNS are on by default	Long-term stable feature set for managed deployments MSI and PKG installers plus group policy templates
One small team tracking Mozilla, so security updates land after Firefox's The project has changed hands in the past, which matters if you are picking it on trust	New features arrive later than in regular Firefox Mainly aimed at organisations rather than home users
Downloadable app	Downloadable app
Open source	Open source
License: MPL-2.0	License: MPL-2.0
No account needed	No account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.