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; U; Win 9x 4.90; ja; rv:1.8.1.20) Gecko/20081217 Firefox/2.0.0.20
• Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.8.1.20) Gecko/20081217 Firefox/2.0.0.20
• Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; it; rv:1.8.1.20) Gecko/20081217 Firefox/2.0.0.20
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.13) Gecko/20080325 Fedora/2.0.0.13-1.fc8 Firefox/2.0.0.13
• Mozilla/5.0 (Windows; U; Windows NT 6.1; ru; rv:1.8.1.4) Gecko/20070515 Firefox/2.0.0.4
• Mozilla/5.0 (Windows; 0; Windows NT 5.1; de-GE; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11 (.NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)
• Mozilla/5.0 (Windows; U; Windows NT 5.1; de-GE; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11 (.NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)
• Mozilla/5.0 (PPC; rv:2.0) Gecko/2007106 Firefox/2.0
• Mozilla/5.0 (PPC; rv:2.0) Gecko/20001211 Firefox/2.0
• Mozilla/5.0 (Windows NT 6.1; rv:2.0) Gecko/2011916 Firefox/2.0
• Mozilla/5.0 (Linux i686; rv:2.0) Gecko/2010617 Firefox/2.0
• Mozilla/5.0 (X11; U; Linux i686; pl; rv:1.8.1.2) Gecko/20070220 Firefox/2.0.0.2
• Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1b1) Gecko/20060708 Firefox/2.0b1
• Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:1.8.1.2pre) Gecko/20061023 SUSE/2.0.0.1-0.1 Firefox/2.0.0.2pre
• Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.7pre) Gecko/20070901 BonEcho/2.0.0.7pre
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.10) Gecko/20071115 Firefox/2.0.0.10 (Debian-2.0.0.10-0etch1)
• Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-GB; rv:1.8.1a2) Gecko/20060512 BonEcho/2.0a2
• Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1) Gecko/20061003 Firefox/2.0
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1) Gecko/20061003 BonEcho/2.0
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.16) Gecko/20080715 Firefox/2.0.0.16
• Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:1.8.1.10) Gecko/20071115 Firefox/2.0.0.10
• Mozilla/5.0 (X11; U; OpenBSD ppc; en-US; rv:1.8.1.9) Gecko/20070223 BonEcho/2.0.0.9
• Mozilla/5.0 (X11; U; Linux i686; en-GB; rv:1.8.1.16) Gecko/20080702 Firefox/2.0.0.16
• Mozilla/5.0 (Windows; U; Windows NT 6.0; es-ES; rv:1.8.1.14) Gecko/20080404 Firefox/2.0.0.13
• Mozilla/5.0 (X11; U; Linux i686; ja; rv:1.8.1.3) Gecko/20070309 Firefox/2.0.0.3
• Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.8.1) Gecko/20061025 BonEcho/2.0
• Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1) Gecko/20060930 BonEcho/2.0
• Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.13) Gecko/20080414 Firefox/2.0.0.13 Pogo/2.0.0.13.6866
• Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1a3) Gecko/20060526 BonEcho/2.0a3
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.11) Gecko/20071204 BonEcho/2.0.0.11
• Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.8.1b2) Gecko/20060831 BonEcho/2.0b2
• Mozilla/5.0 (X11; U; Linux i686; pl-PL; rv:1.8.1.2) Gecko/20060601 Firefox/2.0.0.2 (Ubuntu-edgy)
• Mozilla/5.0 (X11; U; Linux x86; en-US; rv:1.8.1.6) Gecko/20061201 Firefox/2.0.0.6 (Ubuntu-feisty)
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.2) Gecko/20070302 BonEcho/2.0.0.2
• Mozilla/5.0 (X11; U; Linux; it-IT; rv:1.9.1) Gecko/20080913 Firefox/2.0 Midori/0.1.6
• Mozilla/5.0 (Windows; U; Windows NT 5.1; fr-FR; rv:1.8.1.13) Gecko/20080311 Firefox/2.0.0.13
• Mozilla/5.0 (Windows NT 6.3; rv:2.0) Gecko/2004124 Firefox/2.0
• Mozilla/5.0 (Linux x86_64; rv:2.0) Gecko/2008328 Firefox/2.0
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.10) Gecko/20071128 Fedora/2.0.0.10-2.fc7 Firefox/2.0.0.10
• Mozilla/5.0 (X11; U; Linux i686; pl-PL; rv:1.8.1.10) Gecko/20071126 Ubuntu/7.10 (gutsy) Firefox/2.0.0.10
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.7) Gecko/20070921 Firefox/2.0.0.7
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.12) Gecko/20080208 Firefox/2.0.0.12
• Mozilla/5.0 (X11; U; Linux i686; pt-BR; rv:1.8.1.1) Gecko/20061208 Firefox/2.0.0.1
• Mozilla/5.0 (X11; U; Linux i686; pl-PL; rv:1.8.1.3) Gecko/20061201 Firefox/2.0.0.3 (Ubuntu-feisty)
• Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.3) Gecko/2008092417 Firefox/2.0.0.17
• Mozilla/5.0 (X11; U; SunOS i86pc; en-US; rv:1.8.1.11) Gecko/20080118 Firefox/2.0.0.11
• Mozilla/5.0 (BeOS; U; BeOS BePC; en-US; rv:1.8.1.7) Gecko/20070917 BonEcho/2.0.0.7
• Mozilla/5.0 (Windows; U; Windows NT 6.0; it; rv:1.8.1.9) Gecko/20071025 Firefox/2.0.0.9
• Mozilla/5.0 (X11; U; Linux i686; ru; rv:1.8.1.8) Gecko/20071022 Ubuntu/7.10 (gutsy) Firefox/2.0.0.8
• Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9a1) Gecko/20061204 GranParadiso/2.0
• Mozilla/5.0 (X11; U; SunOS sun4v; es-ES; rv:1.8.1.9) Gecko/20071127 Firefox/2.0.0.9
• Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8.1.12) Gecko/20080203 SUSE/2.0.0.12-0.1 Firefox/2.0.0.12
• Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:1.8.1.12pre) Gecko/20080103 BonEcho/2.0.0.12pre
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.16) Gecko/20080715 Ubuntu/7.10 (gutsy) Firefox/2.0.0.16
• Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8.1.6) Gecko/20061201 Firefox/2.0.0.6 (Ubuntu-feisty)
• Mozilla/5.0 (X11; U; Linux i686; de; rv:1.8.1.14) Gecko/20080418 Ubuntu/7.10 (gutsy) Firefox/2.0.0.14
• Mozilla/5.0 (X11; U; Linux i686; pl; rv:1.8.1) Gecko/20061003 Firefox/2.0 Ubuntu
• Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.8.1.16) Gecko/20080702 Firefox/2.0.0.17
• Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-GB; rv:1.8.1.5) Gecko/20070718 Fedora/2.0.0.5-1.fc7 Firefox/2.0.0.5
• Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:1.8.1.20) Gecko/20081217 Firefox/2.0.0.20
• Mozilla/5.0 (BeOS; U; BeOS BePC; en-US; rv:1.8.1.6) Gecko/20070731 BonEcho/2.0.0.6
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1) Gecko/20061031 BonEcho/2.0
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.13) Gecko/20061201 Firefox/2.0.0.13 (Ubuntu-feisty)
• Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8.1.16) Gecko/20080718 Ubuntu/8.04 (hardy) Firefox/2.0.0.16
• Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:1.8.1.14) Gecko/20080417 Firefox/2.0.0.14
• Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8) Gecko/20060319 Firefox/2.0a1
• Mozilla/5.0 (X11; U; Linux i686; en-GB; rv:1.8.1) Gecko/20061031 BonEcho/2.0
• Mozilla/5.0 (Windows; U; Windows NT 6.0; en-GB; rv:1.8.1.5) Gecko/20070713 Firefox/2.0.0.5
• Mozilla/5.0 (X11; U; Linux i686; Ubuntu 7.04; de-CH; rv:1.8.1.5) Gecko/20070309 Firefox/2.0.0.5
• Mozilla/5.0 (X11; U; SunOS sun4u; en-US; rv:1.8.1.2) Gecko/20070226 Firefox/2.0.0.2
• Mozilla/5.0 (X11; U; Linux i686; pl; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6
• Mozilla/5.0 (X11; U; Linux i686; pl-PL; rv:1.8.1.10) Gecko/20071213 Fedora/2.0.0.10-3.fc8 Firefox/2.0.0.10
• Mozilla/5.0 (X11; U; Linux i686; nl; rv:1.8.1.3) Gecko/20060601 Firefox/2.0.0.3 (Ubuntu-edgy)
• Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1a2) Gecko/20060512 BonEcho/2.0a2
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.15) Gecko/20061201 Firefox/2.0.0.15 (Ubuntu-feisty)
• Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8.1.7) Gecko/20070918 Firefox/2.0.0.7
• Mozilla/5.0 (X11; U; OpenBSD ppc; en-US; rv:1.8.1.4) Gecko/20070223 BonEcho/2.0.0.4
• Mozilla/5.0 (X11; U; Linux x86_64; it; rv:1.8.1.2) Gecko/20060601 Firefox/2.0.0.2 (Ubuntu-edgy)
• Mozilla/5.0 (X11; U; Linux i686; zh-TW; rv:1.8.1.3) Gecko/20070309 Firefox/2.0.0.3
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.13) Gecko/20080330 Ubuntu/7.10 (gutsy) Firefox/2.0.0.13 (Linux Mint)
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.14) Gecko/20080525 Firefox/2.0.0.14
• Mozilla/5.0 (X11; U; Linux i686; hu; rv:1.8.1.8) Gecko/20071022 Ubuntu/7.10 (gutsy) Firefox/2.0.0.8
• Mozilla/5.0 (Windows; U; Windows NT 6.0; de; rv:1.8.1.5pre) Gecko/20070604 BonEcho/2.0.0.5pre
• Mozilla/5.0 (X11; U; Linux x86_64; pl; rv:1.8.1.7) Gecko/20071009 Firefox/2.0.0.7
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.16) Gecko/20080715 Fedora/2.0.0.16-1.fc8 Firefox/2.0.0.16
• Mozilla/5.0 (X11; U; SunOS i86pc; en-US; rv:1.8.1.4) Gecko/20070622 Firefox/2.0.0.4
• Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1) Gecko/20061209 BonEcho/2.0
• Mozilla/5.0 (X11; U; SunOS sun4u; en-US; rv:1.8.1.3) Gecko/20070321 Firefox/2.0.0.3
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.17) Gecko/20080922 Ubuntu/7.10 (gutsy) Firefox/2.0.0.17
• Mozilla/5.0 (Windows; U; Windows NT 6.0; de; rv:1.8.1.20) Gecko/20081217 Firefox/2.0.0.20 (.NET CLR 3.5.30729)
• Mozilla/5.0 (X11; U; Linux i686; fr; rv:1.8.1.8) Gecko/20071030 Fedora/2.0.0.8-2.fc8 Firefox/2.0.0.8
• Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.8.1b1) Gecko/20060710 Firefox/2.0b1
• Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8.1.10) Gecko/20061201 Firefox/2.0.0.10 (Ubuntu-feisty)
• Mozilla/5.0 (X11; U; Linux i686; en-GB; rv:1.8.1.16) Gecko/20080715 Ubuntu/7.10 (gutsy) Firefox/2.0.0.16
• Mozilla/5.0 (X11; U; Linux i686; es-AR; rv:1.8.1.6) Gecko/20070803 Firefox/2.0.0.6 (Swiftfox)
• Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.8.1.2) Gecko/20070223 BonEcho/2.0.0.2
• Mozilla/5.0 (X11; U; OpenBSD amd64; en-US; rv:1.8.1.6) Gecko/20070817 Firefox/2.0.0.6
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.15) Gecko/20080702 Ubuntu/8.04 (hardy) Firefox/2.0.0.15
• Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.13
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.3pre) Gecko/20070307 Firefox/2.0.0.3pre (Swiftfox)