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Mercury vs LibreWolf: catalog facts
Mercury	LibreWolf
Free Free and open source.	Free Free and open source under the MPL 2.0, maintained by volunteers.
Windows, macOS, Linux	Windows, macOS, Linux
Compiler-optimized Firefox builds Privacy patches drawn from LibreWolf, Waterfox and IceCat	Deletes cookies and website data on close by default Ships uBlock Origin with custom default filter lists and strict tracking protection
Maintained by a single developer Updates can trail official Firefox releases	The aggressive defaults break some sites and log you out every time you close the browser Resist Fingerprinting changes timezone and window size reporting, which confuses a few web apps
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	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 20, 2026

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