Firefox 3 system requirement

Windows
Operating Systems

    * Windows 2000
    * Windows XP
    * Windows Server 2003
    * Windows Vista

Minimum Hardware

    * Pentium 233 MHz (Recommended: Pentium 500MHz or greater)
    * 64 MB RAM (Recommended: 128 MB RAM or greater)
    * 52 MB hard drive space

Mac
Operating Systems

    * Mac OS X 10.4 and later

Minimum Hardware

    * Macintosh computer with an Intel x86 or PowerPC G3, G4, or G5 processor
    * 128 MB RAM (Recommended: 256 MB RAM or greater)
    * 200 MB hard drive space

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

    * Firefox will not run at all without the following libraries or packages:
          o GTK+ 2.10 or higher
          o GLib 2.12 or higher
          o Pango 1.14 or higher
          o X.Org 1.0 or higher
    * For optimal functionality, we recommend the following libraries or packages:
          o NetworkManager 0.7 or higher
          o DBus 1.0 or higher
          o HAL 0.5.8 or higher
          o GNOME 2.16 or higher