Firefox 22 System Requirements

Windows
Operating Systems

    Windows XP SP2
    Windows Server 2003
    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 22, only 32-bit builds of Firefox 22 are supported at this time.
Recommended Hardware

    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

Recommended Hardware

    Macintosh computer with an Intel x86 processor
    512 MB of RAM
    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:
        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


Mozilla Firefox 22.0 Release Notes

	http://www.mozilla.org/en-US/firefox/22.0/releasenotes/

Size: 20.8MB

Licenza: Freeware

	http://www.mozilla.com/en-US/firefox/

	http://download.mozilla.org/?product=firefox-22.0&os=win&lang=it

All Systems & Languages

	http://www.mozilla.org/en-US/firefox/all/

Su un forum ho letto un paio di persone che dicono di avere problemi con flash player dopo l'aggiornamento a firefox 22.
Sia su linux che su windows.
Aspetterei un attimo prima di aggiornare.