Thursday, 11 June 2026 @ 17:01 UTC ~33 12,987 142,373

Mercury AVX2

Alex313031 · Alex313031.Mercury.AVX2

Firefox fork with compiler optimizations and patches from Librewolf, Waterfox, and GNU IceCat.

Firefox fork with compiler optimizations and patches from Librewolf, Waterfox, and Ghostery. It aims to be the Firefox equivalent of my main project: Thorium (a Chromium fork).

winget install --id Alex313031.Mercury.AVX2 --exact --source winget

Latest 129.0.2

Release Notes
  • Finally updated it, plz don't hate me I know ya'll been waiting
  • Builds for ALL DA OSES!
  • Incorporated some compiler flags from Zen browser, AND, made some commits to Zen as well to add some of Mercury's AVX2 stuff. See > zen-browser/desktop#1216 Thanks to the author for talking to me on Reddit and then accepting my pull request.
  • Disabled "Normandy", a component that allows Mozilla to alter extension configurations at will remotely. (bleh wtf is that)
  • Enabled JS_SHELL, for devs looking to use extensions like https://addons.mozilla.org/en-US/firefox/addon/scratchpad/ to get a semblance of that functionality that they removed.
  • Tabstrip functionality of Firefox View is enabled, without actually enabling firefox view due to it's other bad stuff we don't want (You can still manually enable it in about:config, then re-add it to the tabstrip with the buttons editor).
  • MacOS builds lack PGO, since I had to cross-compile them. May reduce performance. NOTE: For those looking to build for themselves, cross compiling for MacOS is now broken since Apple complained about Mozilla redistributing the XCode SDK (of course 🙄). The workaround involves a lengthy process to package up the SDK from a Mac, then copy it to your Linux machine. It's outside the scope of these release notes, but I may add instructions to the //docs folder at a later date. UI Update: Next release will have some UI patches from Floorp, a popular Firefox fork. However, remember that Mercury doesn't attempt to heavily modify the UI from upstream Firefox, so don't expect Mercury to end up being a compiler optimized Floorp. I promise there won't be a freakin months long delay in updating. But I also tend to put Thorium and Codium first over my other projects. One man can only do so much, even with as often as I am on the computer doing nerd stuff.

Installer type: exe

Architecture Scope Download SHA256
x64 — Download D8E1545ABC897D9D66D92B7CD973419094E2037171A98DEFCC02F865022E6AC5

Details

Homepage
https://github.com/Alex313031/Mercury
License
MPL-2.0
Publisher
Alex313031
Support
https://github.com/Alex313031/Mercury/issues
Copyright
Copyright (c) 2023 Alexander David Frick
Moniker
MercuryAVX2

Tags

avx2avxavx-instructionsbrowsercompiler-optimizationfirefoxfirefox-forkfirefox-forkingmercuryoptimizationprivacysse3web-browserweb-platformwebbrowser