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MozillaBuild is a meta-installer that provides everything needed to build Mozilla on Windows, sans Visual C++. Its source lives in Bugs should be filed in :: MozillaBuild. For information about building Mozilla on Win32, see the Mozilla Developer Center page.

Current Version

The current version of MozillaBuild is 3.3. It is available on

To Upgrade From A Previous Version

Upgrading from an earlier MozillaBuild installation is straightforward but each step is important.

  1. Delete your current MozillaBuild environment by moving your MozillaBuild folder into the trash. If you can't remove the existing installation, you probably have a terminal open or ssh-agent running. Terminate that process and try again.
  2. Install the new MozillaBuild release.
  3. If you had previously enabled Mintty, you will need to do so again by adding SET USE_MINTTY=1 to the top of start-shell.bat.
  4. Run ./mach vcs-setup --update-only to ensure that the version-control-tools repository is current (Mercurial extensions may break otherwise).
  5. Clobber any trees you have by running ./mach clobber (build errors may occur otherwise).
  6. Re-run ./mach bootstrap to ensure that your Rust toolchain is up-to-date.

Release Notes

There are no release notes for 1.1 and below.

Historic Versions

Old versions of MozillaBuild can also be found on