Releases

For up-to-date release information see The Firefox Extension Guru’s Home.
For Thunderbird release information please visit The Email Mafia.


Firefox Prior Releases

 Firefox 2.0

  • 2.0.0.0 – RELEASED: October 24th, 2006
  • 2.0.0.1 – RELEASED: December 19th, 2006
  • 2.0.0.2 – RELEASED: February 23rd, 2007
  • 2.0.0.3 – RELEASED: March 20th, 2007
  • 2.0.0.4 – RELEASED: May 30th, 2007
  • 2.0.0.5 – RELEASED: July 16th, 2007
  • 2.0.0.6 – RELEASED: July 30th, 2007
  • 2.0.0.7 – RELEASED: September 18th, 2007
  • 2.0.0.8 – RELEASED: October 18th, 2007
  • 2.0.0.9 – RELEASED: November 1st, 2007
  • 2.0.0.10 – RELEASED: November 26th, 2007
  • 2.0.0.11 – RELEASED: November30th, 2007
  • 2.0.0.12 – RELEASED: February 7th, 2008
  • 2.0.0.13 – RELEASED: March 25th, 2008
  • 2.0.0.14 – RELEASED: April 16th, 2008
  • 2.0.0.15 – RELEASED: July 1st, 2008
  • 2.0.0.16 – RELEASED: July 15th, 2008
  • 2.0.0.16 > 3.0.1 MU – RELEASED: August 25th, 2008
  • 2.0.0.17 – RELEASED: September 23rd, 2008
  • 2.0.0.18 – RELEASED: November 12th, 2008
  • 2.0.0.18 > 3.0.4 MU – RELEASED: December 4th, 2008
  • 2.0.0.19 – RELEASED: December 16th, 2008
  • 2.0.0.20 – RELEASED: December 18th, 2008

Firefox 3.0

  • 3.0a1/Gecko 1.9a1 – RELEASED: December 8th, 2006
  • 3.0a2/Gecko 1.9a2 – RELEASED: February 7th, 2007
  • 3.0a3/Gecko 1.9a3 – RELEASED: March 23rd, 2007
  • 3.0a4/Gecko 1.9a4 – RELEASED: April 27th, 2007
  • 3.0a5/Gecko 1.9a5 – RELEASED: June 6th, 2007
  • 3.0a6/Gecko 1.9a6 – RELEASED: July 2nd, 2007
  • 3.0a7/Gecko 1.9a7 – RELEASED: August 3rd 2007
  • 3.0m8/Gecko 1.9a8 – RELEASED: September 20th, 2007
  • 3.0b1/Gecko 1.9b1 – RELEASED: November 19th, 2007
  • 3.0b2/Gecko 1.9b2 – RELEASED: December 18th, 2007
  • 3.0b3/Gecko 1.9b3 – RELEASED: February 12th, 2008
  • 3.0b4/Gecko 1.9b4 – RELEASED: March 10th, 2008
  • 3.0b5/Gecko 1.9b5 – RELEASED: April 2nd, 2008
  • 3.0RC1/Gecko 1.9RC1 – RELEASED: May 16th, 2008
  • 3.0RC2/Gecko 1.9RC2 – RELEASED: June 4th, 2008
  • 3.0RC3/Gecko 1.9RC3 – RELEASED: June 11th, 2008
  • 3.0 – RELEASED: June 17th, 2008
  • 3.0.1 -RELEASED: July 16th, 2008
  • 3.0.2 – RELEASED: September 23rd, 2008
  • 3.0.3 – RELEASED: September 26th, 2008
  • 3.0.4 – RELEASED: November 12th, 2008
  • 3.0.5 – RELEASED: December 16th, 2008
  • 3.0.6 – RELEASED: February 3rd, 2009
  • 3.0.7 – RELEASED: March 4th, 2009
  • 3.0.8 – RELEASED: March 27th, 2009
  • 3.0.9 – RELEASED: April 22nd, 2009
  • 3.0.10 – RELEASED: April 27th, 2009
  • 3.0.11 – RELEASED: June 12th, 2009
  • 3.0.12 – RELEASED: July 12th, 2009
  • 3.0.13 – RELEASED: August 3, 2009
  • 3.0.14 – RELEASED: September 10, 2009
  • 3.0.15 – RELEASED: October 27, 2009
  • 3.0.16 – RELEASED: December 15,2009
  • 3.0.17 – RELEASED: January 5, 2010
  • 3.0.18 – RELEASED: February 17, 2010
  • 3.0.19 – RELEASED: March 30, 2010

Firefox 3.1/3.5*

  • 3.1a1 – RELEASED: July 29th, 2008
  • 3.1a2 – RELEASED: September 5th, 2008
  • 3.1b1 – RELEASED: October 14th, 2008
  • 3.1b2 – RELEASED: December 8th, 2008
  • 3.1b3 – RELEASED: March 12th, 2009
  • 3.5b4* – RELEASED: April 27th, 2009
  • 3.5 RC1 – N/A**
  • 3.5 RC2 – RELEASED: June 19th, 2009
  • 3.5 RC3 – RELEASED: June 24th, 2009
  • 3.5 – RELEASED: June 30th, 2009
  • 3.5.1 – RELEASED: July 17th, 2009
  • 3.5.2 – RELEASED: August 3, 2009
  • 3.5.3 – RELEASED: September 10, 2009
  • 3.5.4 – RELEASED: October 27, 2009
  • 3.5.5 – RELEASED: November 6, 2009
  • 3.5.6 – RELEASED: December 15, 2009
  • 3.5.7 – RELEASED: January 8, 2010
  • 3.5.8 – RELEASED: February 17, 2010
  • 3.5.9 – RELEASED: March 30, 2010
  • 3.5.10 – RELEASED: June 22, 2010
  • 3.5.11 – RELEASED: July 20, 2010
  • 3.5.12 – RELEASED: September 7, 2010
  • 3.5.13 – RELEASED: September 16, 2010
  • 3.5.14 – RELEASED: October 19, 2010
  • 3.5.15 – RELEASED: October 27, 2010
  • 3.5.16 – RELEASED: December 9, 2010
  • 3.5.17 – RELEASED: March 1, 2011
  • 3.5.18 – RELEASED: March 22, 2011

Firefox 3.6

  • 3.6a1 – RELEASED: August 7, 2009
  • 3.6b1 – RELEASED: October 30, 2009
  • 3.6b2 – RELEASED: November 11, 2009
  • 3.6b3 – RELEASED: November 17, 2009
  • 3.6b4 – RELEASED: November 26, 2009
  • 3.6b5 – RELEASED: December 17, 2009
  • 3.6RC1 – RELEASED: January 8, 2010
  • 3.6RC2 – RELEASED: January 17, 2010
  • 3.6 – RELEASED: January 21, 2010
  • 3.6.1 – N/A
  • 3.6.2 – RELEASED: March 23, 2010
  • 3.6.3 – RELEASED: April 1, 2010
  • 3.6.4 – RELEASED: June 22, 2010
  • 3.6.5 – N/A
  • 3.6.6 – RELEASED: June 26, 2010
  • 3.6.7 – RELEASED: July 20, 2010
  • 3.6.8 – RELEASED: July 23, 2010
  • 3.6.9 – RELEASED: September 7, 2010
  • 3.6.10 – RELEASED: September 16, 2010
  • 3.6.11 – RELEASED: October 19, 2010
  • 3.6.12 – RELEASED: October 27, 2010
  • 3.6.13 – RELEASED: December 9, 2010
  • 3.6.14 – RELEASED: March 1, 2011
  • 3.6.15 – RELEASED: March 4, 2011
  • 3.6.16 – RELEASED: March 22, 2011
  • 3.6.17 – RELEASED: April 28, 2011
  • 3.6.18 – RELEASED: June 21, 2011
  • 3.6.19 – RELEASED: July 11, 2011 (Mac Only)
  • 3.6.20 – RELEASED: August 16, 2011
  • 3.6.21 – RELEASED: August 30, 2011
  • 3.6.22 – RELEASED: September 6, 2011
  • 3.6.23 – RELEASED: September 27th, 2011
  • 3.6.24 – RELEASED: November 8th, 2011
  • 3.6.25 – RELEASED: December 20th, 2011
  • 3.6.26 – RELEASED: January 31st, 2012
  • 3.6.27 – RELEASED: February 17th, 2012
  • 3.6.28 - RELEASED: March 13th, 2012

Firefox 3.7/4.0 ***

  • 3.7a1 – RELEASED: February 10, 2010
  • 3.7a2 – RELEASED: March 2, 2010
  • 3.7a3 – RELEASED: March 17, 2010
  • 3.7a4 – RELEASED: April 12, 2010
  • 3.7a5 – RELEASED: June 14, 2010
  • 4.0b1 – RELEASED: July 7, 2010
  • 4.0b2 – RELEASED: July 27, 2010
  • 4.0b3 – RELEASED: August 12, 2010
  • 4.0b4 – RELEASED: August 24, 2010
  • 4.0b5 – RELEASED: September 7, 2010
  • 4.0b6 – RELEASED: September 14, 2010
  • 4.0b7 – RELEASED: November 10, 2010
  • 4.0b8 – RELEASED: December 21, 2010
  • 4.0b9 – RELEASED: January 14, 2011
  • 4.0b10 – RELEASED: January 25, 2011
  • 4.0b11 – RELEASED: February 8, 2011
  • 4.0b12 – RELEASED: February 25, 2011
  • 4.0rc1 – RELEASED: March 9, 2011
  • 4.0rc2 – RELEASED: March 18, 2011
  • 4.0 – RELEASED: March 22, 2011
  • 4 Macaw (4.0.1) RELEASED: April 28, 2011

Firefox 5.0

  • 5.0.0 – RELEASED: June 21, 2011
  • 5.0.1 – RELEASED: July 11, 2011 (Mac Only)

Firefox 6.0

  • 6.0.0 - RELEASED: August 16, 2011
  • 6.0.1 – RELEASED: August 30, 2011
  • 6.0.2 – RELEASED: September 6, 2011

Firefox 7 - RELEASED: September 27, 2011

Firefox 8 - RELEASED: November 8, 2011

Firefox 9 - RELEASED: December 20, 2011

Firefox 10 

  • 10.0.0 – RELEASED: January 31, 2012
  • 10.0.1 - RELEASED: February 10, 2012
  • 10.0.2 – RELEASED: February 16. 2012
  • 10.0.3 (Android Only) – RELEASED: March 13, 2012

Firefox 11 - RELEASED: March 13, 2012

Firefox 12 - RELEASED: April 24, 2012

Firefox 13

  • 13.0.0 – RELEASED: June 5, 201
  • 13.0.1 - RELEASED: July 15, 2012

Firefox 14

  • 14.0.1 – RELEASED: July 17, 2012 ^1

Firefox 15 – RELEASED: August 28, 2012

Firefox 16 - RELEASED: October 9, 2012

Firefox 17

  • 17.0.0 – RELEASED: November 20, 2012
  • 17.0.1 – RELEASED: November 30, 2012

Firefox 18

  • 18.0.0 – RELEASED: January 8, 2013
  • 18.0.1 – RELEASED: January 18, 2013
  • 18.0.2 – RELEASED: February 5, 2013

Firefox 19

  • 19.0.0 – RELEASED: February 19, 2013
  • 19.0.1 - RELEASED: February 27, 2013 *Windows 8 Only*
  • 19.0.2 – RELEASED: March 7, 2013

Firefox 20

  • 20.0.0 - RELEASED: April 2, 2013
  • 20.0.1 - RELEASED: April 11, 2013 *Windows Only*

Firefox 21 – RELEASED: May 14, 2013

Firefox 22 – RELEASED: June 25, 2013

Firefox 23

  • 23.0.0 - RELEASED: August 6, 2013
  • 23.0.1 - RELEASED: August 17, 2013

Firefox 24 RELEASED: September 17, 2013

Firefox 25

  • 25.0.0 - RELEASED: October 29, 2013
  • 25.0.1 - RELEASED: November 17, 2013

Firefox 26 RELEASED: December 10, 2013

Firefox 27

  • 27.0.0 - RELEASED: February 4, 2014
  • 27.0.1 - RELEASED: February 13, 2014

Firefox 28 - RELEASED: March 18, 2014

Firefox 10.0.0esr (Extended Support Release)

  • 10.0.0esr – RELEASED: January 31, 2012
  • 10.0.1esr - RELEASED: February 10, 2012
  • 10.0.2esr – RELEASED: February 16. 2012
  • 10.0.3esr – RELEASED: March 13, 2012
  • 10.0.4esr – RELEASED: April 24, 2012
  • 10.0.5esr – RELEASED: June 5, 2012
  • 10.0.6esr – RELEASED: July 17, 2012
  • 10.0.7esr – RELEASED: August 28, 2012
  • 10.0.8esr – RELEASED: October 6, 2012
  • 10.0.9esr – RELEASED: October 11, 2012
  • 10.0.10esr - RELEASED: October 24, 2012
  • 10.0.11esr - RELEASED: November 20, 2012
  • 10.0.11esr - RELEASED: January 8, 2013
         *SUPPORT for 10.0.x esr Branch has ENDED*

Firefox ESR 17.0 (Extended Support Release) ^^

  • 17.0.0esr - RELEASED: November 20, 2012
  • 17.0.1esr - RELEASED: November 29, 2012
  • 17.0.2esr - RELEASED: January 8, 2013
  • 17.0.3esr - RELEASED: February 19, 2013
  • 17.0.4esr - RELEASED: March 7, 2013
  • 17.0.5esr - RELEASED: April 2, 2013
  • 17.0.6esr - RELEASED: May 14, 2013
  • 17.0.7esr - RELEASED: June 25, 2013
  • 17.0.8esr - RELEASED: August 6, 2013
  • 17.0.9esr - RELEASED: September 17, 2013
  • 17.0.10esr - RELEASED: October 29, 2013
  • 17.0.11esr - RELEASED: November 17, 2013
    *SUPPORT for 17.0.x esr Branch has ENDED*

Firefox ESR 24.0 (Extended Support Release) ^^

  • 24.0.0esr - RELEASED: September 17, 2013
  • 24.1.0esr - RELEASED: October 29, 2013
  • 24.1.1esr - RELEASED: November 17, 2013
  • 24.2.0esr - RELEASED: December 10, 2013
  • 24.3.0esr - RELEASED: February 4, 2014
  • 24.4.0esr - RELEASED: March 18, 2014

Notes:

Build numbering was changed from Firefox 3.1 to 3.5 on the Beta 4 release

** Firefox 3.5 RC1 was not a public “beta release” and was pushed out to user on the Beta 4 build

*** Build numbering was changed from Firefox 3.7 (though they were never ‘officially’ labeled as 3.7) to 4.0 on the Beta 1 build as development was shifted to the Gecko 2.0 trunk.

^1Mozilla skipped Firefox 14.0.0 version

^^ Release numbering for future standard and ESR builds subject to change in the event of an unplanned emergency release.