Release date: november 30, 2007 stability update: this release corrects a compatibility issue with some websites and extensions discovered in firefox 20010 earlier changes: fo. Download old version mozilla firefox 20. Mozilla firefox 2009 change log release date: november 1, 2007 oldversioncom provides free software downloads for old versions of programs, drivers and games so why not downgrade to the version you love? because newer is not always better!