Firefox 121 User Agents

Firefox 121 User Agents in our database. This is a listing of only some of the most popular ones.

• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/121.0

  Firefox 121 on Windows 10

• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:121.0) Gecko/20100101 Firefox/121.

  Firefox 121 on Windows 10

• Mozilla/5.0 (X11; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0

  Firefox 121 on GNU/Linux

• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:121.0) Gecko/20100101 Firefox/121.0

  Firefox 121 on Windows 10