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 6.0; Win64; IA64; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0 [ip:209.51.181.162]
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0 OWASMIME/4.0500
• Mozilla/5.0 (Mobile; rv:38.0) Gecko/38.0 Firefox/38.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0; WUID=87073a6089907be31fa7ce7e32a9d03e; WTB=6724) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0 (compatible; AmazonProductDiscovery/1.0; https://vendorcentral.amazon.com/support/amazonproductbot)
• Mozilla/5.0 (Android; 5.0.1 Mobile; rv:38.0.1) Gecko/38.0.1 Firefox/38.0.1
• Mozilla/5.0 (Windows NT 10.0; WOW64; rv:38.0) Gecko/20100101 VideoMost-lite/38.0.1
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0 AlexaToolbar/pu4dcn1f-2.2
• Mozilla/5.0 (X11; Ubuntu; Linux armv7l; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 10.0; Mobile; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 6.0; rv:52.9) Gecko/20100101 Firefox/38.0 K-MeleonGoanna/76.2
• Mozilla/5.0 (Windows NT 6.3; WOW64; rv:52.9) Gecko/20100101 Firefox/38.0 K-MeleonGoanna/76.2
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0 AlexaToolbar/pFRxfJlf-2.2
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0; Mozilla Firefox 38.8.0 - 11712-10116
• Mozilla/5.0 (Windows NT 6.1; rv:64.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:40.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (X11; SunOS i86pc; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (X11; Linux x86_64; rv:38.0; Neustar WPM) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 10.0; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0 OWASMIME/4.0500
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.0; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0 Framafox/38.2.0
• Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:43.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0; Mozilla Firefox 38.5.0 - 11662-10116-81
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0; WUID=6c02d2929d3ed9019e9ccb0f98b51bb1; WTB=29529) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (OS/2; Warp 4.5; rv:38.0) Gecko/20100101 Firefox/38.0 [ip:213.32.4.102]
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0 FirePHP/0.7.4
• Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0 DejaClick/2.9.2.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:33.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0 DejaClick/2.9.0.0
• Mozilla/5.0 (Windows NT 5.1; rv:38.0) Gecko/20100101 20000523 Firefox/38.0
• Mozilla/5.0 (masking-agent; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (X11; Ubuntu; Linux ppc64le; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0 #PMY03808
• Mozilla/5.0 (Windows NT 6.2; rv:38.0.5) Gecko/20100101 Firefox/38.0.5 anonymized by Abelssoft 979969438
• Mozilla/5.0 (Windows NT 6.3; rv:52.9) Gecko/20100101 Firefox/38.0 K-MeleonGoanna/76.2
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0 UZLWIA
• Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0; WUID=694f3d9bae01c4f16cb17290f58688e8; WTB=18195; WUID=694f3d9bae01c4f16cb17290f58688e8; WTB=18195) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 10.0; WOW64; adSSO; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (X11; Linux i686; MW65549; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (X11; Linux x86_64; rv:38.0.1) Gecko/20100101 Firefox/38.0.1 LWS/38.0
• Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:38.0; Tesseract/1.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 10.0; rv:52.9) Gecko/20100101 Firefox/38.0 K-MeleonGoanna/76.2
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.9) Gecko/20100101 Firefox/38.0 K-MeleonGoanna/76.2
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.9) Gecko/20100101 Firefox/38.0 K-MeleonGoanna/76.2
• Mozilla/5.0 (Windows NT 6.1; rv:52.9) Gecko/20100101 Firefox/38.0 K-MeleonGoanna/76.2
• Mozilla/5.0 (OS/2; Warp 4.5; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 5.1; rv:52.9) Gecko/20100101 Firefox/38.0 K-MeleonGoanna/76.2
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; de; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:38.0) Gecko/20100101 Firefox/38.0 AlexaToolbar/p_a2Clhf-2.2 AlexaToolbar/alxf-2.21
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_3; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (X11; Linux x86_64; rv:38.0; Tesseract/1.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0; Tesseract/1.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0 AlexaToolbar/alxf-2.21
• Mozilla/5.0 (X11; Linux i686 on x86_64; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0; TE/1.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (X11; Linux i686; rv:38.0) Gecko/20100101 Firefox/38.0 AlexaToolbar/pZKZ2xdf-2.2
• Mozilla/5.0 (Windows NT 10.0; WOW64; de; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:38.0; Tesseract/1.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0 AlexaToolbar/pRCymxVf-2.2
• Mozilla/5.0 (X11; Linux x86_64; rv:38.0; TE/1.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:38.0) Gecko/20100101 Firefox/38.0.1
• Mozilla/5.0 (Windows NT 6.2; rv:38.0.5) Gecko/20100101 Firefox/38.0.5 anonymized by Abelssoft 609055626
• Mozilla/5.0 (Windows NT 5.1; rv:38.0; WUID=17788a228f5368c9f6d9ef6c90407add; WTB=29369) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0 OWASMIME/4.0200
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:38.0; TE/1.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:38.0) Gecko/20100101 Firefox/38.0 AlexaToolbar/alxf-2.21
• Mozilla/5.0 (X11; FreeBSD amd64; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 6.1; de; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:38.0) Gecko/20100101 Firefox/38.0 AlexaToolbar/alxf-2.21
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 6.1; rv:38.0) Gecko/20100101 Firefox/38.0 AlexaToolbar/alxf-2.21
• Mozilla/5.0 (Windows NT 5.2; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 5.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 6.2; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Android; Tablet; rv:38.0) Gecko/38.0 Firefox/38.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 6.0; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Android; Mobile; rv:38.0.1) Gecko/38.0.1 Firefox/38.0.1
• Mozilla/5.0 (X11; Fedora; Linux i686; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 6.3; WOW64; adSSO; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; adSSO; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 5.2; rv:38.0) Gecko/20100101 Firefox/38.0 K-Meleon/38.7.1esrpre
• Mozilla/5.0 (Windows NT 5.2; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0 K-Meleon/76.0
• Mozilla/5.0 (Windows NT 6.0; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 5.2; rv:38.0) Gecko/20100101 Firefox/38.0 K-Meleon/76.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 6.2; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:38.0; TE/3.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 6.3; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 6.0; rv:38.0) Gecko/20100101 Firefox/38.0 K-Meleon/76.0
• Mozilla/5.0 (Windows NT 6.1; rv:38.0) Gecko/20100101 Firefox/38.0 K-Meleon/38.7.1esrpre
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:38.0) Gecko/20100101 Firefox/38.0
• Mozilla/5.0 (Windows NT 6.2; rv:38.0) Gecko/20100101 Firefox/38.0 K-Meleon/38.7.1esrpre
• Mozilla/5.0 (Windows NT 5.2; rv:38.0) Gecko/20100101 Firefox/38.0