Operating system		Latest stable version	Support status
Windows	10 v1709 and later	Current stable version: 123.0 (ARM64)[1]	2019–
		Older version, yet still maintained: 115.8.0esr (ARM64)[2]
	10 and later, Server 2016 and later	Current stable version: 123.0 (x64)[1]	2015–
		Older version, yet still maintained: 115.8.0esr (x64)[2]
		Current stable version: 123.0 (IA-32)[1]
		Older version, yet still maintained: 115.8.0esr (IA-32)[2]
	7, Server 2008 R2, 8, Server 2012, 8.1 and Server 2012 R2	Older version, yet still maintained: 115.8.0esr (x64)[2] [3]	2015–2024
		Older version, yet still maintained: 115.8.0esr (IA-32)[2] [3]	2009–2024
	XP, Server 2003, Vista and Server 2008	Old version, no longer maintained: 52.9.0esr (IA-32)[4][5]	2004–2018
	2000	Old version, no longer maintained: 10.0.12esr[6]	2004–2013
		Old version, no longer maintained: 12.0[7][8][9]	2004–2012
	NT 4.0 (IA-32), 98 and Me	Old version, no longer maintained: 2.0.0.20[10]	2004–2008
	95	Old version, no longer maintained: 1.5.0.12	2004–2007
macOS	11 (ARM64) and later	Current stable version: 123.0[1] [11]	2020–
		Older version, yet still maintained: 115.8.0esr[2]
	10.15 (x64) and later	Current stable version: 123.0[1]	2019–
		Older version, yet still maintained: 115.8.0esr[2]
	10.12–10.14	Older version, yet still maintained: 115.8.0esr[2] [12]	2016–2024
	10.9–10.11	Old version, no longer maintained: 78.15.0esr[13][14]	2013–2021
	10.6–10.8	Old version, no longer maintained: 45.9.0esr[15]	2009–2017
		Old version, no longer maintained: 48.0.2[16][17][18][19]	2009–2016
	10.5 (IA-32 and x64)	Old version, no longer maintained: 10.0.12esr[6]	2007–2013
		Old version, no longer maintained: 16.0.2[20]	2007–2012
	10.4 (IA-32 and PPC)–10.5 (PPC)	Old version, no longer maintained: 3.6.28[21]	2005–2012
	10.2–10.3	Old version, no longer maintained: 2.0.0.20[10]	2004–2008
	10.0–10.1	Old version, no longer maintained: 1.0.8	2004–2006
Linux (X.Org/Wayland)		Current stable version: 123.0 (x64)[1]	2011–
		Older version, yet still maintained: 115.8.0esr (x64)[2]
		Current stable version: 123.0 (IA-32)[1]	2004–
		Older version, yet still maintained: 115.8.0esr (IA-32)[2]

Notes

• In March 2014, the Windows Store app version of Firefox was cancelled, although there is a beta release.^[22]
• SSE2 instruction set support is required for 49.0 or later for Windows and 53.0 or later for Linux, IA-32 support only applies to superscalar processors.