Mercury -
Compiler optimized, private Firefox fork.


Firefox fork for Linux and Windows named after Firefox's version control system, Mercurial, and the liquid element No. 80.

Highlights  Bulb Icon

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  This nets a 8-20% performance improvement over vanilla Firefox, depending on the benchmark and OS. See for a detailed overview of all modifications compared to vanilla Firefox regarding performance, security and useability.
  See also : Thorium & ThoriumOS


InstallationHard Drive Icon

The Linux releases come in a .zip and .deb package. For Windows, there are .zips and .exe installers. To use the portable .zips:

Windows: MERCURY.bat
Linux: ./
Both of these make a portable user profile dir 
in "USER_DATA" next to the batch file/script.
You can also create a .desktop file using
the sample one provided in the .zip.

Thanks for using Mercury!    Code Of Conduct/Privacy Policy: CoC  Badge Icons

Info Icon Credits: HuMaNs ⚧    404 Test Page: blah  Sad Tab    Dad's Old Site:

Mercury Mascot

"Mechanical Grass" Canvas2D Demo