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Pale Moon vs Firefox ESR: catalog facts
Pale Moon	Firefox ESR
Free The software is free under its open-source licence. Hosting, hardware and external…	Free Free and open source; Mozilla offers optional paid professional support for organisations.
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…	Long-term stable feature set for managed deployments MSI and PKG installers plus group policy templates
The source is MPL but the official binaries carry a separate branding licence, and its older engine misses…	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
Not stated if an account is needed	No account 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 24, 2026

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