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 (Windows NT 6.1; WOW64; rv:50.0) Gecko/20161123 Firefox/50.0; xs-yXXal3WnNSs;
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:50.0) Gecko/20100101 Firefox/50.01668426695272
• Mozilla/5.0 (Windows NT 10.0; rv:50.0) Gecko/20100101 Firefox/50.0@cb236576-dbb6-4dc6-9d50-fde52836a418
• Mozilla/5.0 (Windows; U; Windows NT 5.1; it; rv:1.9.0.16) Gecko/2009120208 Firefox/50.0.1
• Mozilla/5.0 (Windows NT 10.0; WOW64; Rv:50.0) Gecko/20100101 Firefox/50.0 [ip:109.172.91.177]
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:50.0) Gecko/20100101 Firefox/50.0@e06ee4cf-d179-4803-886d-09c2cff0bcfc
• Mozilla/5.0 (X11; U; OpenBSD i386; en-US; rv:1.8.0.4) Gecko/20060628 Firefox/50.0
• Mozilla/5.0 (X11; Linux x86_64; rv:50.0.2) Gecko/20100101 Firefox/50.0.2
• Mozilla/5.0 (Windows NT 6.0; Win64; x64; rv:50.0.1) Gecko/20100101 Firefox/50.0.1
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:50.0) Gecko/20100101 Firefox/50.0 [ip:188.14.231.230]
• Mozilla/5.0 (Windows NT 6.3; rv:50.0.2) Gecko/20100101 Firefox/50.0.2
• Mozilla/5.0 (X11; U; SunOS i86pc; en-US; rv:1.9.0.4) Gecko/2008111710 Firefox/50.0.1
• Mozilla/5.0 (X11; U; Linux i686; fr; rv:1.8) Gecko/20060110 Debian/1.5.dfsg-4 Firefox/50.0
• Mozilla/5.0 (Android 7.1; Tablet; rv:50.0) Gecko/50.0 Firefox/50.0
• Mozilla/5.0 (Android 7.1.2; Tablet; rv:50.0) Gecko/50.0 Firefox/50.0
• Mozilla/5.0 (Android 7.0; Tablet; rv:50.0) Gecko/50.0 Firefox/50.0
• Mozilla/5.0 (X11; U; Linux x86_64; nl-NL; rv:1.7.6) Gecko/20050318 Firefox/50.0.2
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.10) Gecko/20050720 Fedora/1.0.6-1.1.fc4.k12ltsp.4.4.0 Firefox/50.0.2
• Mozilla/5.0 (Windows; U; Windows NT 5.1; nl; rv:1.9.1.6) Gecko/20091201 Firefox/50.0
• Mozilla/5.0 (Windows; U; Windows NT 5.1; fr; rv:1.9.0.13) Gecko/2009073022 Firefox/50.0
• Mozilla/5.0 (X11; U; Linux i686; pl-PL; rv:1.8.1) Gecko/20061010 Firefox/50.0
• Mozilla/5.0 (X11; U; Linux i686; en-GB; rv:1.8.1.8) Gecko/20071008 Ubuntu/7.10 (gutsy) Firefox/50.0.2
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.7) Gecko/20060911 Red Hat/1.5.0.7-0.1.el4 Firefox/50.0
• Mozilla/5.0 (X11; U; SunOS sun4u; en-US; rv:1.8.1.9) Gecko/20071102 Firefox/50.0.1
• Mozilla/5.0 (Windows; U; Windows NT 6.0; tr; rv:1.9.1.1) Gecko/20090715 Firefox/50.0
• Mozilla/5.0 (X11; U; Linux i686; cs-CZ; rv:1.8.0.10) Gecko/20070313 Fedora/1.5.0.10-5.fc6 Firefox/50.0.1
• Mozilla/5.0 (Windows NT 10.0; WOW64; rv:56.0) Gecko/20100101 Firefox/50.0
• Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8) Gecko/20051201 Firefox/50.0.1
• Mozilla/5.0 (X11; U; Linux x86_64; fr; rv:1.9.1.9) Gecko/20100317 SUSE/3.5.9-0.1.1 Firefox/50.0.1
• Mozilla/5.0 (Windows; U; Windows NT 6.0; zh-CN; rv:1.9.2.6) Gecko/20100625 Firefox/50.0.1
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.7) Gecko/20091221 Firefox/50.0
• Mozilla/5.0 (X11; U; Linux i686; de; rv:1.8.1.1) Gecko/20061220 Firefox/50.0.1
• Mozilla/5.0 (Windows; U; Windows NT 5.1; pt-BR; rv:1.9.0.13) Gecko/2009073022 Firefox/50.0
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9a1) Gecko/20060117 Firefox/50.0
• Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US; rv:1.7.9) Gecko/20050711 Firefox/50.0
• Mozilla/5.0 (X11; Linux i686; U; pl; rv:1.8.1) Gecko/20061208 Firefox/50.0
• Mozilla/5.0 (X11; U; Linux i686; en-CA; rv:1.8.0.10) Gecko/20070223 Fedora/1.5.0.10-1.fc5 Firefox/50.0
• Mozilla/5.0 (Windows; U; Windows NT 6.1; zh-CN; rv:1.9.1.3) Gecko/20090824 Firefox/50.0
• Mozilla/5.0 (X11; U; OpenBSD sparc64; en-US; rv:1.8.1.6) Gecko/20070816 Firefox/50.0
• Mozilla/5.0 (X11; Ubuntu; Linux armv7l; rv:50.0) Gecko/20100101 Firefox/50.0
• Mozilla/5.0 (X11; U; OpenBSD i386; en-US; rv:1.8.1.4) Gecko/20070704 Firefox/50.0
• Mozilla/5.0 (X11; U; Linux i686; de; rv:1.8.0.12) Gecko/20070731 Ubuntu/dapper-security Firefox/50.0.2
• Mozilla/5.0 (X11; U; Linux i686; en-GB; rv:1.9.0.10) Gecko/2009042513 Ubuntu/8.04 (hardy) Firefox/50.0.1
• Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1b1) Gecko/20060707 Firefox/50.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6; rv:50.0) Gecko/20100101 Firefox/50.0
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.5) Gecko/2008121718 Gentoo Firefox/50.0
• Mozilla/5.0 (Windows; U; Windows NT 5.1; it-IT; rv:1.7.6) Gecko/20050318 Firefox/50.0.1
• Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.6) Gecko/20050317 Firefox/50.0.2
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.10) Gecko/20050720 Fedora/1.0.6-1.1.fc3 Firefox/50.0
• Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.7) Gecko/20100723 Fedora/3.6.7-1.fc13 Firefox/50.0
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.5) Gecko/20041107 Firefox/50.0
• Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8.1.8) Gecko/20071015 SUSE/2.0.0.8-1.1 Firefox/50.0.2
• Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9) Gecko/2008052906 Firefox/50.0
• Mozilla/5.0 (Windows; U; Windows NT 5.1; ru; rv:1.9.1b3) Gecko/20090305 Firefox/50.0.1
• Mozilla/5.0 (Windows NT 6.3; WOW64; rv:50.0.2) Gecko/20100101 Firefox/50.0.2
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:50.0.2) Gecko/20100101 Firefox/50.0.2
• Mozilla/5.0 (Android 4.0.4; Mobile; rv:50.0) Gecko/50.0 Firefox/50.0
• Mozilla/5.0 (X11; U; Linux i686; fr; rv:1.8.1) Gecko/20060918 Firefox/50.0.2
• Mozilla/5.0 (X11; Linux i686; rv:2.0b3pre) Gecko/20100731 Firefox/50.0.2
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:50.0) Gecko/20100101 Firefox/50.01632406195270
• Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2.2) Gecko/20100316 Firefox/50.0.1
• Mozilla/5.0 (Windows; U; Windows NT 6.0; nl; rv:1.9.2.3) Gecko/20100401 Firefox/50.0.2
• Mozilla/5.0 (X11; U; Linux i686; de; rv:1.8.0.6) Gecko/20060808 Fedora/1.5.0.6-2.fc5 Firefox/50.0.2
• Mozilla/5.0 (Windows NT 10.0; Win64; x64) Gecko/20100101 Firefox/50.0
• Mozilla/5.0 (X11; U; Linux i686; de; rv:1.9.0.14) Gecko/2009090216 Ubuntu/9.04 (jaunty) Firefox/50.0.2
• Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.4) Gecko/20060508 Firefox/50.0.1
• Mozilla/5.0 (X11; U; Linux i686; tr-TR; rv:1.9.0.10) Gecko/2009042523 Ubuntu/9.04 (jaunty) Firefox/50.0.2
• Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-TW; rv:1.9.1.8) Gecko/20100202 Firefox/50.0.1
• Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a1) Gecko/20060323 Firefox/50.0.1
• Mozilla/5.0 (X11; U; OpenBSD sparc64; en-CA; rv:1.8.0.2) Gecko/20060429 Firefox/50.0
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9b3) Gecko/2008020513 Firefox/50.0.2
• Mozilla/5.0 (Android 6.0.99; Tablet; rv:50.0) Gecko/50.0 Firefox/50.0
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.10) Gecko/20071015 SUSE/2.0.0.10-0.2 Firefox/50.0.1
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.1) Gecko/20060313 Fedora/1.5.0.1-9 Firefox/50.0.2
• Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.7.10) Gecko/20050724 Firefox/50.0
• Mozilla/5.0 (Windows NT 10.0; WOW64; rv:50.0; whcashbox: 10-1) Gecko/20100101 Firefox/50.0
• Mozilla/5.0 (Windows; U; Windows NT 6.0; de; rv:1.9.1.9) Gecko/20100315 Firefox/50.0
• Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8.1.15) Gecko/20080702 Ubuntu/8.04 (hardy) Firefox/50.0.2
• Mozilla/5.0 (Windows; U; Windows NT 6.0; sv-SE; rv:1.9.0.18) Gecko/2010020220 Firefox/50.0.1
• Mozilla/5.0 (X11; U; Linux x86_64; pl-PL; rv:1.8.1.13) Gecko/20080325 Ubuntu/7.10 (gutsy) Firefox/50.0.1
• Mozilla/5.0 (X11; U; Linux i686; it-IT; rv:1.7.12) Gecko/20051010 Firefox/50.0
• Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.0.13) Gecko/2009080315 Ubuntu/9.04 (jaunty) Firefox/50.0.2
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.2pre) Gecko/20090729 Ubuntu/9.04 (jaunty) Firefox/50.0.1
• Mozilla/5.0 (Windows; U; Windows NT 5.1; fr; rv:1.9b5) Gecko/2008032620 Firefox/50.0.1
• Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.6) Gecko/20091201 MRA 5.5 (build 02842) Firefox/50.0.2
• Mozilla/5.0 (X11; U; Linux i686; nl; rv:1.9.0.11) Gecko/2009060309 Ubuntu/8.04 (hardy) Firefox/50.0.2
• Mozilla/5.0 (X11; U; Linux i686; zh-TW; rv:1.9.0.7) Gecko/2009030422 Ubuntu/8.04 (hardy) Firefox/50.0
• Mozilla/5.0 (X11; U; Linux x86_64; cs-CZ; rv:1.9.1.7) Gecko/20100106 Ubuntu/9.10 (karmic) Firefox/50.0.2
• Mozilla/5.0 (X11; U; Linux i686; de-DE; rv:1.7.13) Gecko/20060418 Firefox/50.0.1
• Mozilla/5.0 (X11; Linux x86_64) Gecko/ Firefox/50.0.2
• Mozilla/5.0 (Windows NT 6.1; WOW64) Gecko/20100101 Chrome/50.0.1.1 Safari/537.37
• Mozilla/5.0 (Windows NT 10.0; Win64; x64) Gecko/20100101 Chrome/50.0.1.1 Safari/537.37
• Mozilla/5.0 (Windows NT 6.1; WOW64) Gecko/ Chrome/50.0.1.1 Safari/537.37
• Mozilla/5.0 (Android 5.1.1; Tablet; rv:50.0.2) Gecko/50.0.2 Firefox/50.0.2
• Mozilla/5.0 (Windows; U; Windows NT 5.2; da; rv:1.8.1.9) Gecko/20071025 Firefox/50.0.1
• Mozilla/5.0 (Windows NT 10.0; Win64; x64) Gecko/ Firefox/50.0.2
• Mozilla/5.0 (Windows NT 6.1; WOW64) Gecko/20100101 Firefox/50.0.2
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.5) Gecko/20050814 Firefox/50.0
• Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2.4) Gecko/20100523 Firefox/50.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:50.0) Gecko/20100101 Firefox/50.01613238846740