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; Ubuntu; Linux x86_64; rv:63.0) Gecko/20100101 Firefox/63.0 [ip:181.97.95.144]
• Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:63.0) Gecko/20100101 Firefox/63.0 [ip:181.99.180.16]
• Mozilla/5.0 (Android 4.2.2; Tablet; rv:63.0.2) Gecko/63.0.2 Firefox/63.0.2
• Mozilla/5.0 (Windows NT 6.3; Win86; x86; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0 Chrome/96.0.4664.110
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:52.9) Gecko/20100101 Firefox/63.0 Arcticfox/27.9.12
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:61.0) Gecko/20100101 Firefox/63.0 ineTagenT
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.0; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Android 5.0.1; Mobile; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Windows NT 10.0; rv:63.0) Gecko/20100101 Firefox/63.0 anonymized by Abelssoft 163098657
• Mozilla/5.0 (Windows NT 6.1; rv:52.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (X11; Linux x86_64:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Android 4.3; Tablet; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Linux; Android 9.0.0; rv:63.0) Gecko/68.0 Firefox/63.0
• Mozilla/5.0 (Android 5.0; Tablet; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:63.0) Gecko/20100101 Firefox/63.0 [ip:37.160.5.221]
• Mozilla/5.0 (Windows NT 10.0; rv:63.0) Gecko/20100101 Firefox/63.0 anonymized by Abelssoft 293306660
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0 0201015
• Mozilla/5.0 (Windows NT 6.3; WOW64; rv63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Windows NT 10.0; rv:63.0 ) Gecko/20100101 Firefox/63.0 anonymized by Abelssoft 962158057
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:63.0.247) Gecko/20100101 Firefox/63.0.247 Site24x7
• Mozilla/5.0 (Windows NT 6.1; W\x5CxE2\x5Cx80\x5CxA6) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Windows NT 10.0; rv:63.0.3.0) Gecko/20100101 Firefox/63.0.3.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:63.0.3.0) Gecko/20100101 Firefox/63.0.3.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:63.0.1.0) Gecko/20100101 Firefox/63.0.1.0
• Mozilla/5.0 (Windows NT 6.2; WOW64; rv:63.0.1.0) Gecko/20100101 Firefox/63.0.1.0
• Mozilla/5.0 (Windows NT 6.1; rv:63.0.3.0) Gecko/20100101 Firefox/63.0.3.0
• Mozilla/5.0 (Windows NT 10.0; rv:63.0) Gecko/20100101 Firefox/63.0 anonymized by Abelssoft 1627379934
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_1; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Windows NT 6.2; Win64; x64; rv:63.0.3.0) Gecko/20100101 Firefox/63.0.3.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:63.0) Gecko/20120101 Firefox/63.0
• Mozilla/5.0 (Windows NT 6.2; rv:63.0.3) Gecko/20100101 Firefox/63.0.3 anonymized by Abelssoft 760536418
• Mozilla/5.0 (Android 5.0.1; Tablet; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Windows NT 6.1; rv:63.0) Gecko/20100101 Firefox/63.0 anonymized by Abelssoft 332558943
• Mozilla/5.0 (Windows NT 6.1; W\xE2\x80\xA6) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (X11; OpenBSD amd64; Linux x86_64; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Linux; Android 8.0.0; rv:63.0) Gecko/68.0 Firefox/63.0
• Mozilla/5.0 (Linux; Android 8.1.0; rv:63.0) Gecko/68.0 Firefox/63.0
• Mozilla/5.0 (Windows NT 10.0; rv:63.0) Gecko/20100101 Firefox/63.0 anonymized by Abelssoft 1029942172
• Mozilla/5.0 (Android 9.0; Mobile; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0 HCF/3.7.18
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:63.0) Gecko/20100101 Firefox/63.0,gzip(gfe)
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0;secssobrowser) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (X11; Linux i586; rv:31.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Android 9; Tablet; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:65.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (X11; Linux i586; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (X11; Fedora; Linux i686 on x86_64; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0.2
• Mozilla/5.0 (Android 5.0.2; Mobile; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0 IceDragon/63.0.4
• Mozilla/5.0 (X11; Linux i686 on x86_64; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (X11; Fedora; Linux i686; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Windows NT 10.0; WOW64; rv:63.0) Gecko/20100101 Firefox/63.0,gzip(gfe)
• Mozilla/5.0 (Android 5.1; Mobile; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Android 8.0.0; Tablet; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Android 7.1.2; Mobile; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Windows NT 10.0; WOW64; rv:63.0) Gecko/20100101 Firefox/63.0.1
• Mozilla/5.0 (Windows NT 10.0; WOW64; rv:63.0) Gecko/20100101 Firefox/63.0.3
• Mozilla/5.0 (Android 7.1.1; Tablet; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Android 9; Mobile; rv:63.0.2) Gecko/63.0.2 Firefox/63.0.2
• Mozilla/5.0 (Android 9; Mobile; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Android 6.0.1; Mobile; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Android 8.1.0; Tablet; rv:63.0.2) Gecko/63.0.2 Firefox/63.0.2
• Mozilla/5.0 (Android 8.1.0; Tablet; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Android 4.4.2; Tablet; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Android 6.0; Tablet; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Android 8.0.0; Mobile; rv:63.0.2) Gecko/63.0.2 Firefox/63.0.2
• Mozilla/5.0 (Android 7.1.1; Mobile; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Android 6.0; Mobile; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Android 7.0; Tablet; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Android 8.0.0; Mobile; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (X11; FreeBSD amd64; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Windows NT 10.0; Win64; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Android 4.4.4; Mobile; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Windows NT 6.2; WOW64; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Thunderbird/63.0a1
• Mozilla/5.0 (Windows NT 6.2; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Android 4.4.4; Tablet; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Windows NT 6.3; WOW64; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Windows NT 6.3; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Windows NT 6.2; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (X11; Linux i686; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Windows NT 10.0; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Android 7.0; Mobile; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Android 8.1.0; Mobile; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Android 6.0.1; Tablet; rv:63.0) Gecko/63.0 Firefox/63.0
• Mozilla/5.0 (Windows NT 10.0; WOW64; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:63.0) Gecko/20100101 Firefox/63.0