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 (Macintosh; Intel Mac OS X 10_7_1; rv:1.9.2.20) Gecko/3195-06-04 02:00:09 Firefox/4.0
• Mozilla/5.0 (X11; Linux i686; rv:2.0b6pre) Gecko/20100907 Firefox/4.0b6pre Mozilla/5.0 (X11; Linux i686 on x86_64; rv:2.0.1) Gecko/20100101 Firefox/4.0.1
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b4pre) Gecko/20100814 MRA 5.7 (build 03658) Minefield/4.0b4pre
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b4) Gecko/20100818 Firefox/4.0b4 YB/3.5.1
• Mozilla/5.0 (Windows; Windows NT 6.1; WOW64; rv:2.0b3pre) Gecko/20100728 Minefield/4.0b3pre
• Mozilla/5.0 (Windows NT 6.0; rv:2.0b6pre) Gecko/20100908 Firefox/4.0b6pre
• Mozilla/5.0 (Windows; U; Windows NT 6.1; WOW64; en-US; rv:2.0b1) Gecko/20100630 Firefox/4.0b1,gzip(gfe) (via translate.google.com)
• Mozilla/5.0 (Windows NT 6.1; rv:2.0b7pre) Gecko/20101001 Firefox/4.0b7pre
• Mozilla/5.0 (Windows; Windows NT 6.1; WOW64; rv:2.0b3) Gecko/20100805 AskTbFXTV5/3.8.0.12304 Firefox/4.0b3
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.4) Gecko/20100101 Firefox/4.0 [ip:95.232.80.148]
• Mozilla/5.0 (Windows NT 6.0; rv:4.0) Gecko/20151111 Firefox/4.0
• Mozilla/5.0 (Windows NT 5.1; rv:4.0) Gecko/20101220 Firefox/4.0
• Mozilla/5.0 (Windows NT 5.2; rv:4.0) Gecko/2016313 Firefox/4.0
• Mozilla/5.0 (Windows NT 6.1; rv:4.0) Gecko/2007319 Firefox/4.0
• Mozilla/5.0 (Windows NT 6.2; rv:4.0) Gecko/2019820 Firefox/4.0
• Mozilla/5.0 (Windows; U; Windows NT 6.1; ru; rv:1.9.2.3) Gecko/20100401 Firefox/4.0 (.NET CLR 3.5.30729)'DMYWOC<'\x22>JQWPSF
• Mozilla/5.0 (Windows; U; Windows NT 6.1; ru; rv:1.9.2.3) Gecko/20100401 Firefox/4.0 (.NET CLR 3.5.30729)',).\x22.).).
• Mozilla/5.0 (Windows NT 5.0; rv:4.0) Gecko/2017410 Firefox/4.0
• Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:2.0a1pre) Gecko/2008032902 Minefield/4.0a1pre
• Mozilla/5.0 (Windows NT 6.2; rv:2.0b5) Gecko/20100101 Firefox/4.0b5
• Mozilla/5.0 (Linux i686; rv:4.0) Gecko/2006626 Firefox/4.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:4.0) Gecko/20170121 Firefox/4.0.3
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 DiigoBrowser
• Mozilla/5.0 (Windows NT 6.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 Midori/0.5
• Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:2.0a1pre) Gecko/2008032002 Minefield/4.0a1pre
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:2.0b8pre) Gecko/20101209 Firefox/4.0b8pre
• Firefox 4.0
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:2.0a1pre) Gecko/2008060602 Minefield/4.0a1pre
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b8pre) Gecko/20101025 Firefox/4.0b8pre
• Mozilla/5.0 (Windows NT 5.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 PCNBrowser/74866A
• Mozilla/5.0 (Windows NT 5.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 PCNBrowser/BC1C4F
• Mozilla/5.0 (Windows; U; Windows NT 5.2; WOW64; en-US; rv:2.0b1) Gecko/20100630 Firefox/4.0b1,gzip(gfe) (via translate.google.com)
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b7pre) Gecko/20101002 Firefox/4.0b7pre
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0.1) Gecko/20160315 Firefox/4.0.0; xs-n-WxPQ4cvA8;CngGQV;
• Mozilla/5.0 (Windows; U; Windows NT 6.0; io; rv:2.0b8pre) Gecko/20101203 Firefox/4.0b8pre (.NET CLR 3.5.30729)
• Mozilla/5.0 (Windows; U; Windows NT 6.0; ro; rv:2.0b8pre) Gecko/20101203 Firefox/4.0b8pre (.NET CLR 3.5.30729)
• Mozilla/5.0 (Windows; U; Windows NT 6.0; nl-NL; rv:2.0b8pre) Gecko/20101203 Firefox/4.0b8pre (.NET CLR 3.5.30729)
• Mozilla/5.0 (Windows; U; Windows NT 6.0; ru-RU; rv:2.0.1) Gecko/20110428 Firefox/4.0.1 (.NET CLR 3.5.30729)
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0b6) Gecko/20100101 Firefox/4.0b6
• Mozilla/5.0 (Windows NT 5.1; WOW64; rv:41.0) Gecko/20100101 Firefox/4.0.1
• Mozilla/5.0 (Windows; U; Windows NT 5.0; ru-RU; rv:2.0b8pre) Gecko/20101207 Firefox/4.0b8pre
• Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.4) Gecko/20250101 Firefox/4.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0.1) Gecko/20160105 Firefox/4.0.0; xs-i4laXGnVXpQ;
• Mozilla/5.0 (Windows; U; Windows NT 5.0; ru-RU; rv:2.0.1) Gecko/20110428 Firefox/4.0.1
• Mozilla/5.0 (Windows; U; Windows NT 6.0; fy-NL; rv:2.0b1) Gecko/20100628 Firefox/4.0b1 (.NET CLR 3.5.30729)
• Mozilla/5.0 (Windows; U; Windows NT 6.3; ru; rv:3.9.2.3) Gecko/20300403 Firefox/4.0 (.NET CLR 3.5.30729)
• Mozilla/5.0 (X11; Linux i686; rv:2.0.1) Gecko/20110430 Firefox/4.0.1 Firefox/4.0.1
• Mozilla/5.0 (Windows NT 5.1; rv:2.0.1; WUID=4cb934439f8fc0d77e6951bc2fe5892b; WTB=2958) Gecko/20100101 Firefox/4.0.1
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 ineTagenT
• Mozilla/5.0 (Windows NT 6.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 WebMoney Advisor MRA 5.7 (build 03796);
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 WebMoney Advisor MRA 5.6 (build 03278);
• Mozilla/5.0 (Windows NT 5.0; rv:2.0b10) Gecko/20100101 Firefox/4.0b10
• Mozilla/5.0 (X11; Linux i686; rv:2.0.1) Gecko/20110513 Firefox/4.0.1
• Mozilla/5.0 (X11; Linux i686; rv:2.0.1) Gecko/20110514 Firefox/4.0.1
• Mozilla/5.0 (Windows NT 5.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 WebMoney Advisor MRA 5.5 (build 02842);
• Mozilla/5.0 (X11; Linux i686; rv:2.0.1) Gecko/20110601 Firefox/4.0.1
• Mozilla/5.0 (Windows; Windows NT 5.1; rv:2.0b3) Gecko/20100805 Firefox/4.0b3 sputnik 2.5.3.136
• Mozilla/5.0 (Windows; U; Windows NT 5.2; de-DE; rv:2.0b8pre) Gecko/20101206 Firefox/4.0b8pre (.NET CLR 3.5.30729)
• Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:2.0b1) Gecko/20100630 Firefox/4.0b1
• Mozilla/5.0 (Windows NT 6.1; rv:2.0) Gecko/20100101 Firefox/4.0 WebMoney Advisor MRA 5.7 (build 03797);
• Mozilla/5.0 (Windows NT 5.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 WebMoney Advisor MRA 5.7 (build 03797);
• Mozilla/5.0 (Windows NT 6.1; rv:2.0) Gecko/20100101 Firefox/4.0 YB/3.5.3
• Mozilla/5.0 (Windows NT 6.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 WebMoney Advisor MRA 5.4 (build 02652);
• Mozilla/5.0 (Windows NT 5.1; rv:2.0) Gecko/20110324 Firefox/4.0
• Mozilla/5.0 (Windows; Windows NT 5.1; rv:2.0b2) Gecko/20100720 Firefox/4.0b2 sputnik 2.5.3.26
• Mozilla/5.0 (Windows NT 6.1; WOW64; ru; rv:2.0) Gecko/20100101 Firefox/4.0 Opera 12.50
• Mozilla/5.0 (Windows NT 5.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 AlexaToolbar/amznf-3.0.20121130
• Mozilla/5.0 (Windows NT 5.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 WebMoney Advisor MRA 5.6 (build 03278);
• Mozilla/5.0 (Windows NT 5.2; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 WebMoney Advisor
• Mozilla/5.0 (Windows NT 5.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 WebMoney Advisor MRA 5.7 (build 03686);
• Mozilla/5.0 (Windows NT 5.2; WOW64; rv:2.0b7) Gecko/20100101 Firefox/4.0b7
• Mozilla/5.0 (Windows NT 5.1; rv:2.0b10) Gecko/20100101 Firefox/4.0b10 WebMoney Advisor
• Mozilla/5.0 (Windows NT 5.2; WOW64; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 WebMoney Advisor
• Mozilla/5.0 (Windows NT 6.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 WebMoney Advisor MRA 5.7 (build 03757);
• Mozilla/5.0 (Windows NT 5.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 WebMoney Advisor MRA 5.7 (build 03796);
• Mozilla/5.0 (X11; Linux i686; rv:2.0.0) Gecko/20100101 Firefox/4.0
• Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:2.0a1pre) Gecko/2008051003 Minefield/4.0a1pre
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0) Gecko/20100101 Firefox/4.0 WebMoney Advisor
• Mozilla/5.0 (X11; Linux i686; rv:2.0b11) Gecko/20100101 Firefox/4.0b11
• Mozilla/5.0 (Windows NT 5.1; rv:2.0b4) Gecko/20100818 MRA 5.7 (build 03796) Firefox/4.0b4
• Mozilla/5.0 (Windows NT 5.1; rv:2.0b10pre) Gecko/20110120 Firefox/4.0b10pre
• Mozilla/5.0 (Windows NT 5.1; rv:2.0b9pre) Gecko/20110106 Firefox/4.0b9pre
• Mozilla/5.0 (Windows NT 5.1; rv:2.0b9pre) Gecko/20110104 Firefox/4.0b9pre
• Mozilla/5.0 (Windows NT 5.1; rv:2.0b9pre) Gecko/20110101 Firefox/4.0b9pre
• Mozilla/5.0 (Windows NT 5.1; rv:2.0b9pre) Gecko/20101231 Firefox/4.0b9pre
• Mozilla/5.0 (X11; Linux i686; rv:2.0.1) Gecko/20110328 Firefox/4.0.1
• Mozilla/5.0 (Windows NT 6.1; rv:2.0b8pre) Gecko/20101108 Firefox/4.0b8pre
• Mozilla/5.0 (Windows; Windows NT 5.1; rv:2.0b3) Gecko/20100804 Firefox/4.0b3
• Mozilla/5.0 (Windows NT 5.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 MR_LISA
• Mozilla/5.0 (Windows NT 6.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 WebMoney Advisor MRA 5.7 (build 03773);
• Mozilla/5.0 (Windows NT 5.1; rv:2.0.1) Gecko/20110504 Firefox/4.0.1
• Mozilla/5.0 (Windows NT 6.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 WebMoney Advisor MRA 5.7 (build 03797);
• Mozilla/5.0 (Windows NT 5.2; WOW64; rv:2.0.1) Gecko/20100101 Firefox/4.0.1
• Mozilla/5.0 (X11; FreeBSD amd64; rv:2.0.1) Gecko/20100101 Firefox/4.0.1
• Mozilla/5.0 (Windows NT 6.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 WebMoney Advisor
• Mozilla/5.0 (Windows NT 5.1; WOW64; rv:2.0) Gecko/20100101 Firefox/4.0
• Mozilla/5.0 (Windows NT 6.0; rv:2.0b12) Gecko/20100101 Firefox/4.0b12
• Mozilla/5.0 (Windows NT 6.1; rv:2.0) Gecko/20100101 Firefox/4.0 WebMoney Advisor
• Mozilla/5.0 (Windows NT 6.1; rv:2.0b8pre) Gecko/20101110 Firefox/4.0b8pre
• Mozilla/5.0 (X11; Linux i686; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 [ip:213.32.4.245]