For more information, please visit the following pages:

• Thunderbird
• Windows 7
• Mozilla Foundation
• Gecko

Latest user agents (if you are looking for complete list, download it here):

• Mozilla/5.0 (Windows NT 6.1; rv:45.0) Gecko/20100101 Thunderbird/45.5.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.13.0
• Mozilla/5.0 (Windows NT 6.1; rv:102.0) Gecko/20100101 Thunderbird/102.1.2
• Mozilla/5.0 (Windows NT 6.1; rv:91.0) Gecko/20100101 Thunderbird/91.11.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.11.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.10.0
• Mozilla/5.0 (Windows NT 6.1; rv:91.0) Gecko/20100101 Thunderbird/91.9.1
• Mozilla/5.0 (Windows NT 6.1; rv:91.0) Gecko/20100101 Thunderbird/91.10.0
• Mozilla/5.0 (Windows NT 6.1; rv:91.0) Gecko/20100101 Thunderbird/91.8.1
• Mozilla/5.0 (Windows NT 6.1; rv:91.0) Gecko/20100101 Thunderbird/91.8.0
• Mozilla/5.0 (Windows NT 6.1; rv:91.0) Gecko/20100101 Thunderbird/91.7.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.7.0
• Mozilla/5.0 (Windows NT 6.1; rv:91.0) Gecko/20100101 Thunderbird/91.6.1
• Mozilla/5.0 (Windows NT 6.1; rv:91.0) Gecko/20100101 Thunderbird/91.5.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.4.1
• Mozilla/5.0 (Windows NT 6.1; rv:91.0) Gecko/20100101 Thunderbird/91.4.1
• Mozilla/5.0 (Windows NT 6.1; rv:91.0) Gecko/20100101 Thunderbird/91.4.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.4.0
• Mozilla/5.0 (Windows NT 6.1; Win32; x64; rv:80.0) Gecko/20100101 Thunderbird/80.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.3.2
• Mozilla/5.0 (Windows NT 6.1; rv:91.0) Gecko/20100101 Thunderbird/91.2.1
• Mozilla/5.0 (Windows NT 6.1; rv:91.0) Gecko/20100101 Thunderbird/91.3.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0
• Mozilla/5.0 (Windows NT 6.1; rv:78.0) Gecko/20100101 Thunderbird/78.14.0
• Mozilla/5.0 (Windows NT 6.1; rv:78.0) Gecko/20100101 Thunderbird/78.13.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0
• Mozilla/5.0 (Windows NT 6.1; rv:78.0) Gecko/20100101 Thunderbird/78.12.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:68.0) Gecko/20100101 Thunderbird/68.1.0
• Mozilla/5.0 (Windows NT 6.1; rv:5.0) Gecko/20110624 Thunderbird/5.0
• Mozilla/5.0 (Windows NT 6.1; rv:78.0) Gecko/20100101 Thunderbird/78.11.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.10.2
• Mozilla/5.0 (Windows NT 6.1; rv:78.0) Gecko/20100101 Thunderbird/78.10.2
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1
• Mozilla/5.0 (Windows NT 6.1; rv:38.0) Gecko/20100101 Thunderbird/38.7.1 Lightning/4.0.7.1
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.7.1 Lightning/4.0.7.1
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.2.0
• Mozilla/5.0 (Windows NT 6.1; rv:78.0) Gecko/20100101 Thunderbird/78.10.1
• Mozilla/5.0 (Windows NT 6.1; rv:78.0) Gecko/20100101 Thunderbird/78.10.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.9.0
• Mozilla/5.0 (Windows NT 6.1; rv:78.0) Gecko/20100101 Thunderbird/78.9.1
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.9.1
• Mozilla/5.0 (Windows NT 6.1; rv:78.0) Gecko/20100101 Thunderbird/78.9.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.3.0 Lightning/68.3.1
• Mozilla/5.0 (Windows NT 6.1; rv:78.0) Gecko/20100101 Thunderbird/78.8.1
• Mozilla/5.0 (Windows NT 6.1; rv:78.0) Gecko/20100101 Thunderbird/78.8.0
• Mozilla/5.0 (Windows NT 6.1; rv:78.0) Gecko/20100101 Thunderbird/78.7.1
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1
• Mozilla/5.0 (Windows NT 6.1; rv:78.0) Gecko/20100101 Thunderbird/78.7.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.3.3 Lightning/6.2.3.3
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.0 Lightning/5.4.9
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.7.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.6.1
• Mozilla/5.0 (Windows NT 6.1; rv:78.0) Gecko/20100101 Thunderbird/78.6.1
• Mozilla/5.0 (Windows NT 6.1; rv:78.0) Gecko/20100101 Thunderbird/78.6.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1 Lightning/6.2.3.1
• Mozilla/5.0 (Windows; U; Windows NT 6.1; ru; rv:1.8.1.16) Gecko/20080708 Thunderbird/2.0.0.16
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:68.0) Gecko/20100101 Thunderbird/68.3.0 Lightning/68.3.1
• Mozilla/5.0 (Windows NT 6.1; rv:12.0) Gecko/20120428 Thunderbird/12.0.1
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.1.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.5.1
• Mozilla/5.0 (Windows NT 6.1; rv:78.0) Gecko/20100101 Thunderbird/78.5.1
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.0 Lightning/4.7.4
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.6.0 Lightning/6.2.6
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.3.0
• Mozilla/5.0 (Windows NT 6.1; rv:68.0) Gecko/20100101 Thunderbird/68.4.1
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130509 Thunderbird/17.0.6
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:68.0) Gecko/20100101 Thunderbird/68.1.2 Lightning/68.1.2
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 Lightning/6.2.9.1
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:7.0.1) Gecko/20110929 Thunderbird/7.0.1
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.1.0 Lightning/4.7.4
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:68.0) Gecko/20100101 Thunderbird/68.8.1 Lightning/68.8.1
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.0.1
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 Lightning/4.0.3
• Mozilla/5.0 (Windows NT 6.1; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 Lightning/4.0.6
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.7.1 Lightning/4.7.7.1
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.2.1
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 Lightning/68.10.0
• Mozilla/5.0 (Windows NT 6.1; rv:78.0) Gecko/20100101 Thunderbird/78.1.0
• Mozilla/5.0 (Windows NT 6.1; rv:68.0) Gecko/20100101 Thunderbird/68.11.0
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0
• Mozilla/5.0 (Windows NT 6.1; rv:78.0) Gecko/20100101 Thunderbird/78.5.0
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:68.0) Gecko/20100101 Thunderbird/68.1.2
• Mozilla/5.0 (Windows NT 6.1; rv:38.0) Gecko/20100101 Thunderbird/38.1.0 Lightning/4.0.1
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 Lightning/6.2.9
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.5.0 Lightning/6.2.5
• Mozilla/5.0 (Windows; U; Windows NT 6.1; ru; rv:1.8.1.3) Gecko/20070326 Thunderbird/2.0.0.0
• Mozilla/5.0 (Windows NT 6.1; rv:52.0) Gecko/20100101 Thunderbird/52.9.1
• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:68.0) Gecko/20100101 Thunderbird/68.3.0 Lightning/68.3.1.1
• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0
• Mozilla/5.0 (Windows NT 6.1; rv:45.0) Gecko/20100101 Thunderbird/45.5.0 Lightning/4.7.5