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SeaMonkey vs Firefox: catalog facts
SeaMonkey	Firefox
Free The software is free under its open-source licence. Hosting, hardware and external…	Free Free software from a non-profit-owned foundation. Mozilla sells separate subscription…
Windows, macOS, Linux	Windows, macOS, Linux, Android, iOS
It is the continuation of the old Mozilla Application Suite, so browsing, mail, news and page editing live…	Total Cookie Protection stops cookies following you between sites An engine that is not Chromium, which matters for the health of the web
It tracks an older Firefox codebase, so web compatibility and security hardening trail the current browsers.	A small number of sites are still built and tested only against Chromium Mozilla’s revenue comes largely from a search deal, which shapes some defaults
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	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 20, 2026

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