For more information, please visit the following pages:

• Firefox
• Mozilla Foundation
• Gecko

Latest user agents (if you are looking for complete list, download it here):

• Mozilla/5.0 (Android 2.3.5; Mobile; rv:13.0) Gecko/13.0 Firefox/13.0
• Mozilla/5.0 (Macintosh; PPC Mac OS X 10 7_7; rv:1.9.6.20) Gecko/ Firefox/13.0
• Mozilla/5.0 (Macintosh; PPC Mac OS X 10 10_8; rv:1.9.3.20) Gecko/ Firefox/13.0
• Mozilla/5.0 (Windows NT 5.1; hne-IN; rv:1.9.0.20) Gecko/6210-07-15 20:31:54 Firefox/13.0
• Mozilla/5.0 (Windows NT 6.1;) Gecko/20100101 Firefox/13.0.1
• Mozilla/5.0 (Linux i686; rv:13.0) Gecko/2019225 Firefox/13.0
• Mozilla/5.0 (Android 2.3; Mobile; rv:13.0) Gecko/13.0 Firefox/13.0
• Mozilla/5.0 (Windows NT 6.2; rv:13.0) Gecko/2001819 Firefox/13.0
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6.7; rv:13.0) Gecko/20100101 Firefox/13.0.2
• Mozilla/5.0 (Windows NT 6.0; WOW64; rv:13.0) Gecko/20100101 Firefox/13.0.4
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6.8; rv:13.0) Gecko/20100101 Firefox/13.0.7
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5.4; rv:13.0) Gecko/20100101 Firefox/13.0.5
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.5.9; rv:13.0) Gecko/20100101 Firefox/13.0.1
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5.3; rv:13.0) Gecko/20100101 Firefox/13.0.4
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6.8; rv:13.0) Gecko/20100101 Firefox/13.0.2
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6.7; rv:13.0) Gecko/20100101 Firefox/13.0.3
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.5.0; rv:13.0) Gecko/20100101 Firefox/13.0.9
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6.2; rv:13.0) Gecko/20100101 Firefox/13.0.5
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.8.7; rv:13.0) Gecko/20100101 Firefox/13.0.7
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10.4; rv:13.0) Gecko/20100101 Firefox/13.0.6
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6.0; rv:13.0) Gecko/20100101 Firefox/13.0.5
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7.1; rv:13.0) Gecko/20100101 Firefox/13.0.2
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.5.1; rv:13.0) Gecko/20100101 Firefox/13.0.3
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6.3; rv:13.0) Gecko/20100101 Firefox/13.0.9
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.10.8; rv:13.0) Gecko/20100101 Firefox/13.0.3
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.7.6; rv:13.0) Gecko/20100101 Firefox/13.0.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9.0; rv:13.0) Gecko/20100101 Firefox/13.0.9
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.9.6; rv:13.0) Gecko/20100101 Firefox/13.0.9
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8.7; rv:13.0) Gecko/20100101 Firefox/13.0.8
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.8.8; rv:13.0) Gecko/20100101 Firefox/13.0.8
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.5.9; rv:13.0) Gecko/20100101 Firefox/13.0.4
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6.0; rv:13.0) Gecko/20100101 Firefox/13.0.6
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6.7; rv:13.0) Gecko/20100101 Firefox/13.0.5
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9.8; rv:13.0) Gecko/20100101 Firefox/13.0.7
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5.2; rv:13.0) Gecko/20100101 Firefox/13.0.9
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5.6; rv:13.0) Gecko/20100101 Firefox/13.0.4
• Mozilla/5.0 (Windows NT 6.2; WOW64; rv:13.0) Gecko/20100101 Firefox/13.0.0
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.7.4; rv:13.0) Gecko/20100101 Firefox/13.0.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6.0; rv:13.0) Gecko/20100101 Firefox/13.0.2
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9.7; rv:13.0) Gecko/20100101 Firefox/13.0.8
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.9.1; rv:13.0) Gecko/20100101 Firefox/13.0.4
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10.4; rv:13.0) Gecko/20100101 Firefox/13.0.0
• Mozilla/5.0 (Windows NT 6.1; rv:13.0) Gecko/20100101 Firefox/13.0.9
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7.4; rv:13.0) Gecko/20100101 Firefox/13.0.6
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5.4; rv:13.0) Gecko/20100101 Firefox/13.0.3
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6.9; rv:13.0) Gecko/20100101 Firefox/13.0.8
• Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10.10.2; rv:13.0) Gecko/20100101 Firefox/13.0.9
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6.2; rv:13.0) Gecko/20100101 Firefox/13.0.1
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6.4; rv:13.0) Gecko/20100101 Firefox/13.0.6
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.7.9; rv:13.0) Gecko/20100101 Firefox/13.0.6
• Mozilla/5.0 (Windows NT 5.1; WOW64; rv:13.0) Gecko/20100101 Firefox/13.0.9
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6.0; rv:13.0) Gecko/20100101 Firefox/13.0.5
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7.3; rv:13.0) Gecko/20100101 Firefox/13.0.9
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9.3; rv:13.0) Gecko/20100101 Firefox/13.0.3
• Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:13.0) Gecko/20100101 Firefox/13.0.3
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.8.5; rv:13.0) Gecko/20100101 Firefox/13.0.4
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.10.1; rv:13.0) Gecko/20100101 Firefox/13.0.3
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9.3; rv:13.0) Gecko/20100101 Firefox/13.0.4
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.10.5; rv:13.0) Gecko/20100101 Firefox/13.0.5
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9.7; rv:13.0) Gecko/20100101 Firefox/13.0.7
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5.3; rv:13.0) Gecko/20100101 Firefox/13.0.1
• Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:13.0) Gecko/20100101 Firefox/13.0.0
• Mozilla/5.0 (Windows NT 6.0; Win64; x64; rv:13.0) Gecko/20100101 Firefox/13.0.6
• Mozilla/5.0 (Windows NT 6.3; WOW64; rv:13.0) Gecko/20100101 Firefox/13.0.8
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:13.0) Gecko/20100101 Firefox/13.0.1
• Mozilla/5.0 (Windows NT 5.2; Win64; x64; rv:13.0) Gecko/20100101 Firefox/13.0.2
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6.1; rv:13.0) Gecko/20100101 Firefox/13.0.1
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.8.4; rv:13.0) Gecko/20100101 Firefox/13.0.3
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8.1; rv:13.0) Gecko/20100101 Firefox/13.0.7
• Mozilla/5.0 (Windows NT 6.0; WOW64; rv:13.0) Gecko/20100101 Firefox/13.0.3
• Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:13.0) Gecko/20100101 Firefox/13.0.4
• Mozilla/5.0 (Windows NT 6.2; Win64; x64; rv:13.0) Gecko/20100101 Firefox/13.0.3
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.7.1; rv:13.0) Gecko/20100101 Firefox/13.0.8
• Mozilla/5.0 (Windows NT 6.0; WOW64; rv:13.0) Gecko/20100101 Firefox/13.0.9
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9.1; rv:13.0) Gecko/20100101 Firefox/13.0.1
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7.9; rv:13.0) Gecko/20100101 Firefox/13.0.4
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.10.9; rv:13.0) Gecko/20100101 Firefox/13.0.2
• Mozilla/5.0 (Windows NT 6.0; WOW64; rv:13.0) Gecko/20100101 Firefox/13.0.0
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.7.1; rv:13.0) Gecko/20100101 Firefox/13.0.6
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.10.5; rv:13.0) Gecko/20100101 Firefox/13.0.0
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6.4; rv:13.0) Gecko/20100101 Firefox/13.0.5
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7.6; rv:13.0) Gecko/20100101 Firefox/13.0.5
• Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20100101 Firefox/13.0.7
• Mozilla/5.0 (Windows NT 6.0; Win64; x64; rv:13.0) Gecko/20100101 Firefox/13.0.8
• Mozilla/5.0 (Windows NT 6.1; rv:13.0) Gecko/20100101 Firefox/13.0.8
• Mozilla/5.0 (Windows NT 5.1; Win64; x64; rv:13.0) Gecko/20100101 Firefox/13.0.6
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6.4; rv:13.0) Gecko/20100101 Firefox/13.0.7
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.10.1; rv:13.0) Gecko/20100101 Firefox/13.0.7
• Mozilla/5.0 (Windows NT 5.2; WOW64; rv:13.0) Gecko/20100101 Firefox/13.0.5
• Mozilla/5.0 (Windows NT 6.2; Win64; x64; rv:13.0) Gecko/20100101 Firefox/13.0.5
• Mozilla/5.0 (X11; Linux i686; rv:13.0) Gecko/20100101 Firefox/13.0.2
• Mozilla/5.0 (X11; Linux i686; rv:13.0) Gecko/20100101 Firefox/13.0.5
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10.0; rv:13.0) Gecko/20100101 Firefox/13.0.5
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5.1; rv:13.0) Gecko/20100101 Firefox/13.0.9
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.9.4; rv:13.0) Gecko/20100101 Firefox/13.0.6
• Mozilla/5.0 (Windows NT 5.1; Win64; x64; rv:13.0) Gecko/20100101 Firefox/13.0.8
• Mozilla/5.0 (Windows NT 6.3; rv:13.0) Gecko/20100101 Firefox/13.0.3
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8.3; rv:13.0) Gecko/20100101 Firefox/13.0.5
• Mozilla/5.0 (Windows NT 6.0; Win64; x64; rv:13.0) Gecko/20100101 Firefox/13.0.9
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8.2; rv:13.0) Gecko/20100101 Firefox/13.0.0