- March 31, 1998: The Mozilla Project forms as an open source project at Netscape and releases source code
- June 5, 2002: Mozilla 1.0 released
- July 2003: Mozilla Foundation founded
- February 2004: Mozilla Europe founded
- August 2004: Mozilla Japan founded
- November 9, 2004: Mozilla Firefox 1.0 released
- March 4th, 2005: Mozilla China Foundation founded
- August 2005: Mozilla Foundation creates Mozilla Corporation
- November 29, 2005: Mozilla Firefox 1.5 released
- October 24, 2006: Mozilla Firefox 2.0 released
- June 17, 2008: Mozilla releases Firefox 3 and sets a Guinness World Record for the largest number of software downloads in 24 hours
- June 30, 2009: Firefox 3.5 released
- January 21, 2010: Firefox 3.6 released
February 8, 2011: Do Not Track added to Firefox 4 beta
March 22, 2011: Firefox 4 released
March 29, 2011: Firefox 4 for Android released
June 11, 2011: Firefox for Android becomes first mobile browser to support Do Not Track
June 18, 2011: Mozilla launches Web FWD accelerator
July 25, 2011: Mozilla announces Boot to Gecko project
January 18, 2012: SOPA/PIPA action request on Firefox default start page generates 360,000 emails to U.S. lawmakers
February 27, 2012: Mozilla announces partnership with Telefónica Digital on first Open Web devices
May 22, 2012: Mozilla Webmaker introduced
June 26, 2012: Upgraded Firefox for Android released
July 2, 2012: Firefox OS brand and partnerships announced