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 (Android 10; Mobile; rv:139.0) Gecko/17230123 Firefox/139.0
• Mozilla/5.0 (Android 11; Mobile; rv:139.0) Gecko/17956523 Firefox/139.0
• Mozilla/5.0 (Android 12; Mobile; rv:139.0) Gecko/12077137 Firefox/139.0
• Mozilla/5.0 (Android 12; Mobile; rv:139.0) Gecko/14835285 Firefox/139.0
• Mozilla/5.0 (Android 11; Mobile; rv:139.0) Gecko/13384997 Firefox/139.0
• Mozilla/5.0 (X11; Linux x86_64; rv:139.0) Gecko/20100101 Firefox/139.0 [ip:93.35.129.104]
• Mozilla/5.0 (Android 12; Mobile; rv:139.0) Gecko/13614111 Firefox/139.0
• Mozilla/5.0 (Android 12; Mobile; rv:139.0) Gecko/27355894 Firefox/139.0 [ip:45.91.184.202]
• Mozilla/5.0 (Android 11; Mobile; rv:139.0) Gecko/25070600 Firefox/139.0
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Firefox/139.0 [ip:93.187.88.1]
• Mozilla/5.0 (Android 10; Mobile; rv:139.0) Gecko/10497066 Firefox/139.0
• Mozilla/5.0 (Android 12; Mobile; rv:139.0) Gecko/27667226 Firefox/139.0
• Mozilla/5.0 (Android 12; Mobile; rv:139.0) Gecko/21352802 Firefox/139.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 12.2; rv:139.0) Gecko/20100101 Firefox/139.0
• Mozilla/5.0 (Android 11; Mobile; rv:139.0) Gecko/23785254 Firefox/139.0
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/29032898 Firefox/139.0 [ip:93.44.193.27]
• Mozilla/5.0 (Android 12; Mobile; rv:139.0) Gecko/29152051 Firefox/139.0 [ip:93.44.193.27]
• Mozilla/5.0 (Android 12; Mobile; rv:139.0) Gecko/26752821 Firefox/139.0
• Mozilla/5.0 (Android 14; Mobile; rv:139.0) Gecko/26864245 Firefox/139.0
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/29945378 Firefox/139.0
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Firefox/139.0 [ip:217.171.73.1]
• Mozilla/5.0 (Android 11; Mobile; rv:139.0) Gecko/28036173 Firefox/139.0
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/18781369 Firefox/139.0 [ip:109.55.44.138]
• Mozilla/5.0 (Android 12; Mobile; rv:139.0) Gecko/28268312 Firefox/139.0
• Mozilla/5.0 (Android 14; Mobile; rv:139.0) Gecko/11394946 Firefox/139.0
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/12268660 Firefox/139.0
• Mozilla/5.0 (Android 11; Mobile; rv:139.0) Gecko/28957377 Firefox/139.0
• Mozilla/5.0 (X11; Linux x86_64; rv:139.0) Gecko/20100101 Firefox/139.0 [ip:151.74.148.62]
• Mozilla/5.0 (Android 14; Mobile; rv:139.0) Gecko/25679106 Firefox/139.0
• Mozilla/5.0 (Android 10; Mobile; rv:139.0) Gecko/13887655 Firefox/139.0
• Mozilla/5.0 (Android 14; Mobile; rv:139.0) Gecko/12983239 Firefox/139.0
• Mozilla/5.0 (Android 14; Mobile; rv:139.0) Gecko/21562089 Firefox/139.0
• Mozilla/5.0 (Android 10; Mobile; rv:139.0) Gecko/23441170 Firefox/139.0
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/28971979 Firefox/139.0
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/22064295 Firefox/139.0
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/27460826 Firefox/139.0 [ip:78.210.223.35]
• Mozilla/5.0 (Android 11; Mobile; rv:139.0) Gecko/17407738 Firefox/139.0 [ip:185.186.107.1]
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/29726753 Firefox/139.0
• Mozilla/5.0 (Android 12; Mobile; rv:139.0) Gecko/29476947 Firefox/139.0
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/26564032 Firefox/139.0
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/16762253 Firefox/139.0
• Mozilla/5.0 (Android 14; Mobile; rv:139.0) Gecko/21884953 Firefox/139.0
• Mozilla/5.0 (Android 14; Mobile; rv:139.0) Gecko/13331597 Firefox/139.0
• Mozilla/5.0 (Android 12; Mobile; rv:139.0) Gecko/17875040 Firefox/139.0 [ip:93.44.193.27]
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/20016074 Firefox/139.0
• Mozilla/5.0 (Android 10; Mobile; rv:139.0) Gecko/19998478 Firefox/139.0 [ip:93.44.193.27]
• Mozilla/5.0 (Android 12; Mobile; rv:139.0) Gecko/12782400 Firefox/139.0
• Mozilla/5.0 (Android 11; Mobile; rv:139.0) Gecko/139.0 Firefox/139.0 [ip:151.34.113.131]
• Mozilla/5.0 (Android 11; Mobile; rv:139.0) Gecko/139.0 Firefox/139.0 [ip:151.34.109.73]
• Mozilla/5.0 (Android 11; Mobile; rv:139.0) Gecko/139.0 Firefox/139.0 [ip:151.57.253.28]
• Mozilla/5.0 (Android 14; Mobile; rv:139.0) Gecko/25471742 Firefox/139.0
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Firefox/139.0.4
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Firefox/139.0.1
• Mozilla/5.0 (Android 14; Mobile; rv:139.0) Gecko/14147091 Firefox/139.0
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/10934746 Firefox/139.0
• Mozilla/5.0 (Android 12; Mobile; rv:139.0) Gecko/24969755 Firefox/139.0
• Mozilla/5.0 (Android 11; Mobile; rv:139.0) Gecko/28194128 Firefox/139.0
• Mozilla/5.0 (Android 12; Mobile; rv:139.0) Gecko/16623900 Firefox/139.0
• Mozilla/5.0 (Android 14; Mobile; rv:139.0) Gecko/27794297 Firefox/139.0 [ip:195.216.203.1]
• Mozilla/5.0 (Android 11; Mobile; rv:139.0) Gecko/27920929 Firefox/139.0
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Firefox/139.0 [ip:81.126.56.124]
• Mozilla/5.0 (Android 12; Mobile; rv:139.0) Gecko/27824983 Firefox/139.0
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Firefox/139.0 [ip:108.89.134.176]
• Mozilla/5.0 (Android 12; Mobile; rv:139.0) Gecko/26827788 Firefox/139.0
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/17179819 Firefox/139.0
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Firefox/139.0 [ip:93.131.21.233]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Firefox/139.0 [ip:93.146.168.237]
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:139.0.4-2) Gecko/20100101 Firefox/139.0.4-2 r3dfox/139.0.4-2
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:139.0.4-2) Gecko/20100101 Firefox/139.0.4-2_(r3dfox)
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/19751397 Firefox/139.0
• Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:139.0) Gecko/20100101 Firefox/139.0 [ip:78.51.187.150]
• Mozilla/5.0 (Android 12; Mobile; rv:139.0) Gecko/10094579 Firefox/139.0
• Mozilla/5.0 (Android 12; Mobile; rv:139.0) Gecko/18192463 Firefox/139.0
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/18202961 Firefox/139.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:139.0) Gecko/20100101 Firefox/139.0 [ip:93.35.165.154]
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/139.0 Firefox/139.0 [ip:93.106.175.145]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Firefox/139.0 [ip:93.65.247.171]
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/20327119 Firefox/139.0
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/10733803 Firefox/139.0
• Mozilla/5.0 (Android 11; Mobile; rv:139.0) Gecko/25573133 Firefox/139.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:139.0) Gecko/20100101 Firefox/139.0 [ip:88.97.209.101]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Firefox/139.0 [ip:93.44.193.139]
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/18689337 Firefox/139.0
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:139.0) Gecko/20100101 Firefox/139.0
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Firefox/139.0 [ip:151.95.28.7]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Firefox/139.0 [ip:93.146.169.62]
• Mozilla/5.0 (Android 10; Mobile; rv:139.0) Gecko/28339427 Firefox/139.0 [ip:5.91.72.185]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Firefox/139.0 [ip:93.65.247.82]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Firefox/139.0 [ip:84.141.37.243]
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/139.0 Firefox/139.0 [ip:37.174.83.173]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Firefox/139.0 [ip:151.0.254.136]
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/139.0 Firefox/139.0 [ip:185.102.219.217]
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/139.0 Firefox/139.0 [ip:159.242.234.55]
• Mozilla/5.0 (X11; Linux x86_64; rv:139.0) Gecko/20100101 Firefox/139.0 [ip:46.138.39.134]
• Mozilla/5.0 (Android 14; Mobile; rv:139.0) Gecko/21575803 Firefox/139.0
• Mozilla/5.0 (Android 12; Mobile; rv:139.0) Gecko/12594680 Firefox/139.0
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/139.0 Firefox/139.0 [ip:5.62.41.32]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Firefox/139.0 [ip:87.16.156.107]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Firefox/139.0 [ip:195.5.14.56]
• Mozilla/5.0 (Android 13; Mobile; rv:139.0) Gecko/139.0 Firefox/139.0 [ip:151.47.220.204]