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Pale Moon vs SeaMonkey: catalog facts
Pale Moon	SeaMonkey
Free The software is free under its open-source licence. Hosting, hardware and external…	Free The software is free under its open-source licence. Hosting, hardware and external…
Windows, macOS, Linux	Windows, macOS, Linux
It keeps the pre-Quantum Gecko engine and the old XUL extension model, so add-ons that Firefox dropped still…	It is the continuation of the old Mozilla Application Suite, so browsing, mail, news and page editing live…
The source is MPL but the official binaries carry a separate branding licence, and its older engine misses…	It tracks an older Firefox codebase, so web compatibility and security hardening trail the current browsers.
Downloadable app	Downloadable app
Open source	Open source
License: MPL-2.0	License: MPL-2.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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