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. There are releases for many OS version and platforms. Windows Operating Systems (32-bit and 64-bit) Windows XP / Vista / 7 / 8.x / 10 Linux 32 and 64-bit Mac OS X NOTE: For older OSes use older releases.