Please note that GNU/Linux distributors may provide packages for your distribution which have different requirements.
Macintosh computer with an Intel x86 processor.
Pentium 4 or newer processor that supports SSE2.
To install Firefox on a Windows XP system, because of Windows restrictions, the user will have to download Firefox 43.0.1 and then update to the current release. Please note that 64-bit builds of Firefox are only supported on Windows 7 and higher. If you are currently running Windows Vista (with Service Pack 1), you can upgrade to Windows 7 directly from within Vista. Windows Operating Systems (32-bit and 64-bit)