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Momiji vs Firefox ESR: catalog facts
Momiji	Firefox ESR
Free Free and open source under the MPL-2.0 licence.	Free Free and open source; Mozilla offers optional paid professional support for organisations.
macOS	Windows, macOS, Linux
Modern Firefox ESR engine on macOS 10.7 to 10.14 Supports 64-bit Macs back to Conroe and Merom processors	Long-term stable feature set for managed deployments MSI and PKG installers plus group policy templates
Hardware acceleration can be buggy and may need turning off DRM video such as Netflix and Spotify needs an extra Widevine install	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
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 24, 2026

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