RESTRICTED
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Firefox 4 for desktop/laptop PCs will be supported in the following configurations:

• Microsoft Windows
  • 32-bit builds only
  • minimum version: Windows 2000
  • CPU architecture: i386, x86-64

• Mac OS X
  • 32- and 64-bit builds (universal binary)
  • minimum version: Mac OS X 10.5
  • CPU architecture: i386, x86-64

• Linux
  • 32-bit builds only
  • minimum version: tbd
  • CPU architecture: i386, x86-64

Proposed changes

• only support i386 w/SSE2
• support 64-bit Linux builds (requires plugin/OOPP support?)