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 6.1; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:134.0.2.230]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:84.206.50.98]
• Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:89.251.245.203]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:164.131.160.49]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:185.24.186.196]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:192.54.200.178]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:164.131.160.50]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:158.102.162.21]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:164.131.160.51]
• Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0 xwLrLZ8M-51 1966300506
• Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:45.231.218.204]
• Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:168.197.200.79]
• Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:190.173.155.107]
• Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:168.197.201.35]
• Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:190.173.169.195]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:190.123.90.42]
• Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:190.173.170.230]
• Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:190.173.185.206]
• Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:181.209.107.210]
• Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:181.46.39.32]
• Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:45.175.143.153]
• Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:138.97.202.77]
• Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:190.173.187.21]
• Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:190.173.156.170]
• Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:200.2.127.14]
• Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:186.19.166.101]
• Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:45.178.97.21]
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:181.15.139.211]
• Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:190.48.30.218]
• Mozilla/5.0 (Windows NT 6.1; Win64; x86; rv:91.0) Gecko/20100101 Firefox/91.0
• Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0 Firefox 91.0 Win10
• Mozilla/5.0 (X11; Ubuntu 16.04; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0
• Mozilla/5.0 (Android 9.0.0; Mobile; SAMSUNG SM-A505F/DS; rv:91.0) Gecko/20100101 Firefox/91.0
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:158.102.162.36]
• Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:37.163.252.101]
• Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Goanna/4.8 Firefox/91.0
• Mozilla/5.0 (Linux x86; rv:91.0) Gecko/20100101 Firefox/91.0
• Mozilla/5.0 (X11; Linux x86; rv:91.0) Gecko/20100101 Firefox/91.0
• Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:5.11.126.229]
• Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:5.77.77.244]
• Mozilla/5.0 (Android 10; Mobile; rv:91.0) Gecko/91.0 Firefox/91.0 [ip:185.220.101.12]
• Mozilla/5.0 (Android 10; Mobile; rv:91.0) Gecko/91.0 Firefox/91.0 [ip:185.220.102.241]
• Mozilla/5.0 (Android 10; Mobile; rv:91.0) Gecko/91.0 Firefox/91.0 [ip:185.181.61.23]
• Mozilla/5.0 (Android 10; Mobile; rv:91.0) Gecko/91.0 Firefox/91.0 [ip:162.247.73.192]
• Mozilla/5.0 (Android 10; Mobile; rv:91.0) Gecko/91.0 Firefox/91.0 [ip:185.220.102.244]
• Mozilla/5.0 (Android 10; Mobile; rv:91.0) Gecko/91.0 Firefox/91.0 [ip:45.134.225.36]
• Mozilla/5.0 (Android 10; Mobile; rv:91.0) Gecko/91.0 Firefox/91.0 [ip:185.243.218.110]
• Mozilla/5.0 (Android 10; Mobile; rv:91.0) Gecko/91.0 Firefox/91.0 [ip:103.251.167.21]
• Mozilla/5.0 (X11; Linux aarch64; rv:91.0) Gecko/20100101 Firefox/91.0 Parse User Agent
• Mozilla/5.0 (Android 10; Mobile; rv:91.0) Gecko/91.0 Firefox/91.0 [ip:103.251.167.10]
• Mozilla/5.0 (Android 10; Mobile; rv:91.0) Gecko/91.0 Firefox/91.0 [ip:95.214.52.156]
• Mozilla/5.0 (Android 10; Mobile; rv:91.0) Gecko/91.0 Firefox/91.0 [ip:185.220.101.32]
• Mozilla/5.0 (Android 10; Mobile; rv:91.0) Gecko/91.0 Firefox/91.0 [ip:141.255.161.166]
• Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:151.55.183.0]
• Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:87.0.236.167]
• Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:87.9.232.247]
• Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:87.14.233.61]
• Mozilla/5.0 (Windows NT 6.1; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:95.250.39.86]
• Mozilla/5.0 (Windows NT 6.1; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:95.245.31.45]
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:185.234.71.56]
• Mozilla/5.0 (Windows NT 6.1; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:79.42.191.104]
• Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:23.137.251.61]
• Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:79.45.238.245]
• Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:185.220.101.6]
• Mozilla/5.0 (Android 10; Mobile; rv:91.0) Gecko/91.0 Firefox/91.0 [ip:5.91.76.25]
• Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:193.189.100.206]
• Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:185.220.101.12]
• Mozilla/5.0 (Windows NT 6.1; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:95.252.157.45]
• Mozilla/5.0 (Android 10; Mobile; rv:91.0) Gecko/91.0 Firefox/91.0 [ip:5.91.71.121]
• Mozilla/5.0 (Android 10; Mobile; rv:91.0) Gecko/91.0 Firefox/91.0 [ip:5.91.70.12]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:147.161.247.74]
• Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:82.56.163.78]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:158.102.162.38]
• Mozilla/5.0 (Android 10; Mobile; rv:91.0) Gecko/91.0 Firefox/91.0 [ip:5.91.76.78]
• Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:79.10.109.18]
• Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:185.220.103.7]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:165.225.95.46]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:147.161.245.111]
• Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:87.118.116.90]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:165.225.95.37]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:147.161.247.76]
• Mozilla/5.0 (Android 10; Mobile; rv:91.0) Gecko/91.0 Firefox/91.0 [ip:5.91.78.157]
• Mozilla/5.0 (Android 10; Mobile; rv:91.0) Gecko/91.0 Firefox/91.0 [ip:5.91.71.91]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:147.161.247.71]
• Mozilla/5.0 (Windows NT 6.1; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:87.13.180.85]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:85.159.196.173]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:165.225.203.69]
• Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:188.68.52.231]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:85.159.196.160]
• Mozilla/5.0 (Android 10; Mobile; rv:91.0) Gecko/91.0 Firefox/91.0 [ip:5.91.67.102]
• Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:185.220.101.22]
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:93.41.117.40]
• Mozilla/5.0 (Android 10; Mobile; rv:91.0) Gecko/91.0 Firefox/91.0 [ip:2.226.232.110]
• Mozilla/5.0 (Android 10; Mobile; rv:91.0) Gecko/91.0 Firefox/91.0 [ip:5.91.79.57]
• Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:77.109.103.102]
• Mozilla/5.0 (Windows NT 6.1; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:95.252.157.86]
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:217.56.100.254]
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:85.159.196.157]
• Mozilla/5.0 (Windows NT 6.1; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:79.12.199.71]
• Mozilla/5.0 (Windows NT 6.1; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:95.246.193.127]