History of Firefox

              The Mozilla Firefox project was created by Dave Hyatt and Blake Ross as an experimental branch of the Mozilla project.

1.  Firefox 1.0 was released on November 9, 2004.
2.  Firefox 1.5 was released on November 29, 2005. 
3. Version 2.0 was released on October 24, 2006. 
4. Firefox 3.0 was released on June 17, 2008, with Version 3.5 and Version 3.6 released on June 30, 2009 and January 21, 2010 respectively.
5.  Version 4.0 was released on March 22, 2011,
6.  Version 5.0 was released on June 21, 2011, 
7. Version 6.0 was released on August 16, 2011, 
8. Version 7.0 was released on September 27, 2011 and 
9. Version 8.0, the current release, was released on November 8, 2011

version 1.0 to 3.0 screenshots see the link: http://lifehacker.com/396206/the-history-of-firefox-10-to-30-in-screenshots