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Mercury vs Mullvad Browser: catalog facts
Mercury	Mullvad Browser
Free Free and open source.	Free Free to download and use. No Mullvad account or subscription is required, and the browser…
Windows, macOS, Linux	Windows, macOS, Linux
Compiler-optimized Firefox builds Privacy patches drawn from LibreWolf, Waterfox and IceCat	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
Maintained by a single developer Updates can trail official Firefox releases	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
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	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 21, 2026

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