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SeaMonkey vs Waterfox: catalog facts
SeaMonkey	Waterfox
Free The software is free under its open-source licence. Hosting, hardware and external…	Free Free and open source under MPL-2.0. Development is funded by donations.
Windows, macOS, Linux	Windows, macOS, Linux
It is the continuation of the old Mozilla Application Suite, so browsing, mail, news and page editing live…	Telemetry and data collection are removed from the build, not just disabled in preferences Ad blocking and private, anonymised DNS are on by default
It tracks an older Firefox codebase, so web compatibility and security hardening trail the current browsers.	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
Downloadable app	Downloadable app
Open source	Open source
License: MPL-2.0	License: MPL-2.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 21, 2026

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