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Floorp vs Mercury: catalog facts
Floorp	Mercury
Free Free and open source under MPL-2.0. The project asks for sponsorship but nothing in the…	Free Free and open source.
Windows, macOS, Linux	Windows, macOS, Linux
Vertical tabs, workspaces, split view and web panels are built in rather than bolted on with extensions Firefox underneath, so Gecko, containers and Firefox add-ons all still work	Compiler-optimized Firefox builds Privacy patches drawn from LibreWolf, Waterfox and IceCat
A small team rebasing on Firefox, so security updates arrive after Mozilla's, not with them Less-travelled code than Firefox itself, which means interface bugs the main browser does not have	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.