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Mullvad Browser vs Mercury: catalog facts
Mullvad Browser	Mercury
Free Free to download and use. No Mullvad account or subscription is required, and the browser…	Free Free and open source.
Windows, macOS, Linux	Windows, macOS, Linux
Built with the Tor Project, so the fingerprinting defences are the ones Tor Browser ships Works with any VPN, or none, and needs no Mullvad account	Compiler-optimized Firefox builds Privacy patches drawn from LibreWolf, Waterfox and IceCat
Without a VPN in front of it your IP address is as visible as in any other browser Anti-fingerprinting breaks some sites and makes others demand repeated captchas	Maintained by a single developer Updates can trail official Firefox releases
Downloadable app	Downloadable app
Open source	Open source
License: MPL-2.0	License: MPL-2.0
No account needed	No account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 23, 2026

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