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Firefox ESR vs Supermium: catalog facts
Firefox ESR	Supermium
Free Free and open source; Mozilla offers optional paid professional support for organisations.	Free Free to download from its GitHub repository.
Windows, macOS, Linux	Windows
Long-term stable feature set for managed deployments MSI and PKG installers plus group policy templates	Current Chromium engine on Windows XP through Windows 8.x Tracks recent Chromium versions
New features arrive later than in regular Firefox Mainly aimed at organisations rather than home users	Windows only Maintained by a small team, so security fixes may lag behind Chrome
Downloadable app	Downloadable app
Open source	Closed source
License: MPL-2.0	License not stated
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 24, 2026	Official website Full listing and sources Checked September 23, 2026

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