Firefox 21 User Agents

Firefox 21 User Agents in our database. This is a listing of only some of the most popular ones.

• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:21.0) Gecko/20100101 Firefox/21.0

  Firefox 21 on Mac 10

• Mozilla/5.0 (X11; FreeBSD amd64; rv:21.0) Gecko/20100101 Firefox/21.0

  Firefox 21 on FreeBSD

• Mozilla/5.0 (X11; FreeBSD amd64; Linux x86_64; rv:21.0) Gecko/20130331 Firefox/21.0

  Firefox 21 on FreeBSD

• Mozilla/5.0 (Windows NT 6.1; rv:57.0) Gecko/20100101 Firefox/21E1

  Firefox 21 on Windows 7

• Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:21.0) Gecko/20130331 Firefox/21.0

  Firefox 21 on Ubuntu

• Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:21.0) Gecko/20100101 Firefox/21.0

  Firefox 21 on Ubuntu

• Mozilla/5.0 (X11; Linux i686; rv:21.0) Gecko/20100101 Firefox/21.0)

  Firefox 21 on GNU/Linux

• Mozilla/5.0 (X11; Linux i686; rv:21.0) Gecko/20100101 Firefox/21.0

  Firefox 21 on GNU/Linux

• Mozilla/5.0 (Windows NT 6.2; WOW64; rv:21.0) Gecko/20130514 Firefox/21.0

  Firefox 21 on Windows 8

• Mozilla/5.0 (Windows NT 6.2; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0

  Firefox 21 on Windows 8

• Mozilla/5.0 (Windows NT 6.2; Win64; x64; rv:21.0.0) Gecko/20121011 Firefox/21.0.0

  Firefox 21 on Windows 8

• Mozilla/5.0 (Windows NT 6.2; Win64; x64; rv:16.0.1) Gecko/20121011 Firefox/21.0.1

  Firefox 21 on Windows 8

• Mozilla/5.0 (Windows NT 6.2; rv:21.0) Gecko/20130326 Firefox/21.0

  Firefox 21 on Windows 8

• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20130401 Firefox/21.0

  Firefox 21 on Windows 7

• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20130331 Firefox/21.0

  Firefox 21 on Windows 7

• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20130330 Firefox/21.0

  Firefox 21 on Windows 7

• Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0

  Firefox 21 on Windows 7

• Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:16.0.1) Gecko/20121011 Firefox/21.0.1

  Firefox 21 on Windows 7

• Mozilla/5.0 (Windows NT 6.1; rv:21.0) Gecko/20130401 Firefox/21.0

  Firefox 21 on Windows 7

• Mozilla/5.0 (Windows NT 6.1; rv:21.0) Gecko/20100101 Firefox/21.0

  Firefox 21 on Windows 7

• Mozilla/5.0 (Windows NT 5.1; rv:21.0) Gecko/20130401 Firefox/21.0

  Firefox 21 on Windows XP

• Mozilla/5.0 (Windows NT 5.1; rv:21.0) Gecko/20130331 Firefox/21.0

  Firefox 21 on Windows XP

• Mozilla/5.0 (Windows NT 5.1; rv:21.0) Gecko/20100101 Firefox/21.0)

  Firefox 21 on Windows XP

• Mozilla/5.0 (Windows NT 5.1; rv:21.0) Gecko/20100101 Firefox/21.0

  Firefox 21 on Windows XP

• Mozilla/5.0 (Windows NT 5.0; rv:21.0) Gecko/20100101 Firefox/21.0

  Firefox 21 on Windows 2000

• Mozilla/5.0 (Windows NT 10.0; Win64; x64) Gecko/20100101 Firefox/21.0

  Firefox 21 on Windows 10

• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:21.0) Gecko/20100101 Firefox/21.0

  Firefox 21 on Mac 10