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Microsoft Edge vs Firefox ESR: catalog facts
Microsoft Edge	Firefox ESR
Free Free to download and use. The software is closed source.	Free Free and open source; Mozilla offers optional paid professional support for organisations.
Windows, macOS, Linux, Android, iOS	Windows, macOS, Linux
Vertical tabs, tab groups, sleeping tabs and a built-in PDF reader are standard, and it runs Chrome extensions…	Long-term stable feature set for managed deployments MSI and PKG installers plus group policy templates
The browser Microsoft ships is proprietary, and it pushes Bing, Microsoft accounts and a growing set of promoted…	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
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.