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Firefox is no longer supported on Windows 8.1 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

Firefox is no longer supported on macOS 10.14 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

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Firefox System Requirements

Firefox 39.0

Windows

Operating Systems

  • Windows XP SP2
  • Windows Server 2003 SP1
  • Windows Vista
  • Windows 7
  • Windows 8

Please note that while the 32-bit and 64-bit versions of Windows Vista and Windows 7 can be used to run Firefox, only 32-bit builds of Firefox are supported at this time.

  • Pentium 4 or newer processor that supports SSE2
  • 512MB of RAM
  • 200MB of hard drive space

Mac

Operating Systems

  • Mac OS X 10.6
  • Mac OS X 10.7
  • Mac OS X 10.8
  • Mac OS X 10.9
  • Mac OS X 10.10
  • Macintosh computer with an Intel x86 processor
  • 512 MB of RAM
  • 200 MB hard drive space

GNU/Linux

Software Requirements

Please note that GNU/Linux distributors may provide packages for your distribution which have different requirements.

  • Firefox will not run at all without the following libraries or packages:
    • GTK+ 2.18 or higher
    • GLib 2.22 or higher
    • Pango 1.14 or higher
    • X.Org 1.0 or higher (1.7 or higher is recommended)
    • libstdc++ 4.3 or higher
  • For optimal functionality, we recommend the following libraries or packages:
    • NetworkManager 0.7 or higher
    • DBus 1.0 or higher
    • HAL 0.5.8 or higher
    • GNOME 2.16 or higher

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