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; 8455 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (Windows NT 6.1; rv:28.0) Gecko/20200123 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2226 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7717 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8050 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2892 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7203 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8740 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 1546 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7177 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7640 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7960 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7808 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7853 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8716 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8135 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8878 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (Windows NT 5.2; WOW64; rv:28.0) Gecko/20200214 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8965 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8511 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7652 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2395 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7746 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8853 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 1981 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2467 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7594 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2602 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7908 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7131 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7854 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7847 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 1950 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8570 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 1550 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7231 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8331 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7246 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7857 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2265 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8481 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2116 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7166 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8342 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2407 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8871 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8909 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8321 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7533 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8452 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8436 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2345 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2828 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8403 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8036 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2146 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2451 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2108 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2588 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2856 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8398 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2557 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7393 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2901 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7555 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2598 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2717 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2561 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 1620 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2972 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8884 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8171 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 1958 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2731 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7727 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8205 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8655 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7300 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8154 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8160 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2211 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2325 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2753 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 1695 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2555 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2826 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2576 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 1967 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7033 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 1547 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2980 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7635 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8768 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 8782 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7444 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2659 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 1759 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2669 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 2225 ;Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0
• Mozilla/5.0 (X11; Ubuntu; 7990 ; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0