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 (X11; FreeBSD amd64; rv:5.0) Gecko/20100101 Firefox/5.0 [ip:134.209.137.157]
• Mozilla/5.0 (Macintosh; PPC Mac OS X 10 7_9; rv:1.9.5.20) Gecko/ Firefox/5.0
• Mozilla/5.0 (Windows; U; Windows NT 6.1; rv:5.0) Gecko/20100101 Firefox/5.0
• Mozilla/5.0 (Linux i686; rv:5.0) Gecko/20191022 Firefox/5.0
• Mozilla/5.0 (Linux x86_64; rv:5.0) Gecko/200591 Firefox/5.0
• Mozilla/5.0 (Linux x86_64; rv:5.0) Gecko/2017212 Firefox/5.0
• Mozilla/5.0 (Windows NT 5.2; sk-SK; rv:1.9.0.20) Gecko/2012-05-22 00:50:13 Firefox/5.0
• Mozilla/5.0 (Windows NT 5.0; rv:5.0) Gecko/20031015 Firefox/5.0
• Mozilla/5.0 (Windows NT 5.0; rv:5.0) Gecko/2013111 Firefox/5.0
• Mozilla/5.0 (Windows NT 5.0; rv:5.0) Gecko/2010107 Firefox/5.0
• Mozilla/5.0 (Windows NT 6.2; rv:5.0) Gecko/200843 Firefox/5.0
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.10.9; rv:5.0) Gecko/20100101 Firefox/5.0.1
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.10.7; rv:5.0) Gecko/20100101 Firefox/5.0.9
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7.6; rv:5.0) Gecko/20100101 Firefox/5.0.6
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.7.8; rv:5.0) Gecko/20100101 Firefox/5.0.6
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6.1; rv:5.0) Gecko/20100101 Firefox/5.0.5
• Mozilla/5.0 (Windows NT 6.0; WOW64; rv:5.0) Gecko/20100101 Firefox/5.0.7
• Mozilla/5.0 (Macintosh; PPC Mac OS X 10.10.9; rv:5.0) Gecko/20100101 Firefox/5.0.2
• Mozilla/5.0 (Windows NT 5.2; rv:5.0) Gecko/20100101 Firefox/5.0.9
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9.4; rv:5.0) Gecko/20100101 Firefox/5.0.5
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8.7; rv:5.0) Gecko/20100101 Firefox/5.0.4
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.5.5; rv:5.0) Gecko/20100101 Firefox/5.0.7
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.8.6; rv:5.0) Gecko/20100101 Firefox/5.0.8
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7.2; rv:5.0) Gecko/20100101 Firefox/5.0.4
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6.7; rv:5.0) Gecko/20100101 Firefox/5.0.1
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.9.1; rv:5.0) Gecko/20100101 Firefox/5.0.2
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5.7; rv:5.0) Gecko/20100101 Firefox/5.0.5
• Mozilla/5.0 (Windows NT 6.1; rv:5.0) Gecko/2004618 Firefox/5.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8.8; rv:5.0) Gecko/20100101 Firefox/5.0.9
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9.4; rv:5.0) Gecko/20100101 Firefox/5.0.4
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.5.9; rv:5.0) Gecko/20100101 Firefox/5.0.5
• Mozilla/5.0 (Macintosh; PPC Mac OS X 10.8.7; rv:5.0) Gecko/20100101 Firefox/5.0.9
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.10.5; rv:5.0) Gecko/20100101 Firefox/5.0.7
• Mozilla/5.0 (X11; Linux x86_64; rv:5.0) Gecko/20100101 Firefox/5.0.5
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6.8; rv:5.0) Gecko/20100101 Firefox/5.0.1
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5.9; rv:5.0) Gecko/20100101 Firefox/5.0.9
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.8.6; rv:5.0) Gecko/20100101 Firefox/5.0.0
• Mozilla/5.0 (Windows NT 6.2; Win64; x64; rv:5.0) Gecko/20100101 Firefox/5.0.5
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9.1; rv:5.0) Gecko/20100101 Firefox/5.0.6
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.5.9; rv:5.0) Gecko/20100101 Firefox/5.0.0
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.7.7; rv:5.0) Gecko/20100101 Firefox/5.0.8
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.10.5; rv:5.0) Gecko/20100101 Firefox/5.0.3
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5.0; rv:5.0) Gecko/20100101 Firefox/5.0.1
• Mozilla/5.0 (Windows NT 6.0; WOW64; rv:5.0) Gecko/20100101 Firefox/5.0.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7.0; rv:5.0) Gecko/20100101 Firefox/5.0.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7.5; rv:5.0) Gecko/20100101 Firefox/5.0.7
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7.2; rv:5.0) Gecko/20100101 Firefox/5.0.7
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6.4; rv:5.0) Gecko/20100101 Firefox/5.0.7
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7.2; rv:5.0) Gecko/20100101 Firefox/5.0.3
• Mozilla/5.0 (Windows NT 5.0; WOW64; rv:5.0) Gecko/20100101 Firefox/5.0.8
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10.3; rv:5.0) Gecko/20100101 Firefox/5.0.0
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6.3; rv:5.0) Gecko/20100101 Firefox/5.0.8
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7.1; rv:5.0) Gecko/20100101 Firefox/5.0.7
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10.1; rv:5.0) Gecko/20100101 Firefox/5.0.7
• Mozilla/5.0 (Windows NT 5.2; rv:5.0) Gecko/20100101 Firefox/5.0.7
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.9.3; rv:5.0) Gecko/20100101 Firefox/5.0.2
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6.8; rv:5.0) Gecko/20100101 Firefox/5.0.9
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6.6; rv:5.0) Gecko/20100101 Firefox/5.0.6
• Mozilla/5.0 (X11; Linux i686; rv:5.0) Gecko/20100101 Firefox/5.0.2
• Mozilla/5.0 (X11; Linux i686; rv:5.0) Gecko/20100101 Firefox/5.0.4
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.7.5; rv:5.0) Gecko/20100101 Firefox/5.0.6
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6.1; rv:5.0) Gecko/20100101 Firefox/5.0.6
• Mozilla/5.0 (Windows NT 6.0; WOW64; rv:5.0) Gecko/20100101 Firefox/5.0.5
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.8.8; rv:5.0) Gecko/20100101 Firefox/5.0.1
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.5.3; rv:5.0) Gecko/20100101 Firefox/5.0.8
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.10.7; rv:5.0) Gecko/20100101 Firefox/5.0.6
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6.0; rv:5.0) Gecko/20100101 Firefox/5.0.2
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.7.6; rv:5.0) Gecko/20100101 Firefox/5.0.9
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.10.3; rv:5.0) Gecko/20100101 Firefox/5.0.7
• Mozilla/5.0 (X11; Linux i686; rv:5.0) Gecko/20100101 Firefox/5.0.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:5.0) Gecko/20100101 Firefox/5.0.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7.4; rv:5.0) Gecko/20100101 Firefox/5.0.7
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.5.1; rv:5.0) Gecko/20100101 Firefox/5.0.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10.7; rv:5.0) Gecko/20100101 Firefox/5.0.9
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8.4; rv:5.0) Gecko/20100101 Firefox/5.0.2
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.10.8; rv:5.0) Gecko/20100101 Firefox/5.0.4
• Mozilla/5.0 (Macintosh; PPC Mac OS X 10.10.0; rv:5.0) Gecko/20100101 Firefox/5.0.5
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10.0; rv:5.0) Gecko/20100101 Firefox/5.0.9
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7.5; rv:5.0) Gecko/20100101 Firefox/5.0.0
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6.7; rv:5.0) Gecko/20100101 Firefox/5.0.2
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.9.8; rv:5.0) Gecko/20100101 Firefox/5.0.4
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.10.5; rv:5.0) Gecko/20100101 Firefox/5.0.0
• Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10.5.8; rv:5.0) Gecko/20100101 Firefox/5.0.6
• Mozilla/5.0 (Windows NT 5.0; WOW64; rv:5.0) Gecko/20100101 Firefox/5.0.0
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5.5; rv:5.0) Gecko/20100101 Firefox/5.0.5
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.7.9; rv:5.0) Gecko/20100101 Firefox/5.0.5
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.5.1; rv:5.0) Gecko/20100101 Firefox/5.0.4
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5.9; rv:5.0) Gecko/20100101 Firefox/5.0.4
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8.9; rv:5.0) Gecko/20100101 Firefox/5.0.3
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.5.9; rv:5.0) Gecko/20100101 Firefox/5.0.2
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6.7; rv:5.0) Gecko/20100101 Firefox/5.0.3
• Mozilla/5.0 (Windows NT 6.0; rv:5.0) Gecko/20100101 Firefox/5.0.1
• Mozilla/5.0 (Windows NT 5.2; WOW64; rv:5.0) Gecko/20100101 Firefox/5.0.7
• Mozilla/5.0 (Windows NT 5.0; Win64; x64; rv:5.0) Gecko/20100101 Firefox/5.0.6
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7.4; rv:5.0) Gecko/20100101 Firefox/5.0.5
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10.2; rv:5.0) Gecko/20100101 Firefox/5.0.7
• Mozilla/5.0 (Windows NT 5.2; Win64; x64; rv:5.0) Gecko/20100101 Firefox/5.0.6
• Mozilla/5.0 (Windows NT 6.3; WOW64; rv:5.0) Gecko/20100101 Firefox/5.0.3
• Mozilla/5.0 (Windows NT 5.1; rv:5.0) Gecko/20100101 Firefox/5.0.9
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10.7; rv:5.0) Gecko/20100101 Firefox/5.0.5