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Supermium vs Firefox ESR: catalog facts
Supermium	Firefox ESR
Free Free to download from its GitHub repository.	Free Free and open source; Mozilla offers optional paid professional support for organisations.
Windows	Windows, macOS, Linux
Current Chromium engine on Windows XP through Windows 8.x Tracks recent Chromium versions	Long-term stable feature set for managed deployments MSI and PKG installers plus group policy templates
Windows only Maintained by a small team, so security fixes may lag behind Chrome	New features arrive later than in regular Firefox Mainly aimed at organisations rather than home users
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MPL-2.0
No account needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

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