Supported build configurations

There are multiple levels or tiers of Mozilla build "support". These tiers represent the shared priorities of the Mozilla project.

Tier-1 platform refers to platforms that are the primary focus for development. Build errors, performance regressions, and other major problems on these platforms are considered showstoppers that will cause a change to be immediately reverted. These are also the platforms that show up on the Firefox and Firefox OS continuous integration, and run on the Mozilla try-server. The tier-1 platforms are:

  • Android Linux/x86 and ARMv7 (gcc)
  • Linux/x86 and x86-64 (gcc and clang)
  • OS X/x86 and x86-64 (clang)
  • Windows/x86 and Windows/x86-64 (msvc)

Tier-2 platforms are those platforms that the Mozilla community actively maintains. Breakage or regressions in these platforms does not immediately close the tree; developers who break these platforms are expected to work with platform maintainers to fix problems, and may be required to back out if a fix cannot be found:

  • Android ARMv6 (gcc)

Tier-3 platforms have a maintainer or community which attempt to keep the platform working. These platforms may or may not work at any time, and often have little test coverage:

  • Linux on various CPU architectures including ARM, PPC, 68k — maintained by various Linux distributions
  • OpenSolaris/x86&SPARC — maintained by Simon.Jin <> and Ginn.Chen <>
  • OS X/ppc (gcc) — maintained by Cameron Kaiser
  • FreeBSD (gcc) — maintained by Jan Beich
  • OpenBSD (gcc) — maintained by Landry Breuil
  • Darwin/X11 — maintained by Jeremy Huddleston
  • Windows/x86 and x86-64 (mingw gcc) — maintained by Jacek Caban — some features are disabled because they require MS COM or the w32api project doesn't expose the necessary Windows APIs

Most Mozilla developers do not have access to non-tier-1 platforms so any bug reports against non-tier-1 platforms should be overflowing with information to help the owner of the bug determine the cause of the problem and the proper solution. If you can provide a patch and/or verify that the developer's patches work for your platform, that would help a lot towards getting your bugs fixed and checked into the tree.

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Last updated by: BenjaminSmedberg,