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Firefox vs Firefox ESR: catalog facts
Firefox	Firefox ESR
Free Free software from a non-profit-owned foundation. Mozilla sells separate subscription…	Free Free and open source; Mozilla offers optional paid professional support for organisations.
Windows, macOS, Linux, Android, iOS	Windows, macOS, Linux
Total Cookie Protection stops cookies following you between sites An engine that is not Chromium, which matters for the health of the web	Long-term stable feature set for managed deployments MSI and PKG installers plus group policy templates
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	New features arrive later than in regular Firefox Mainly aimed at organisations rather than home users
Downloadable app	Downloadable app
Open source	Open source
License: MPL-2.0	License: MPL-2.0
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 24, 2026

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