Firefox 21 User Agents

Showing user agents for Firefox version 21. This is a listing of the most recent user agents detected from this software version.

  • Mozilla/5.0 (X11; FreeBSD amd64; Linux x86_64; rv:21.0) Gecko/20130331 Firefox/21.0
    Firefox 21 on FreeBSD
  • Mozilla/5.0 (X11; FreeBSD amd64; rv:21.0) Gecko/20100101 Firefox/21.0
    Firefox 21 on FreeBSD
  • 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 (Macintosh; Intel Mac OS X 10.7; rv:21.0) Gecko/20100101 Firefox/21.0 AlexaToolbar/pe1qjZPf-2.1
    Firefox 21 on Mac 10
  • Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:21.0) Gecko/20100101 Firefox/21.0
    Firefox 21 on Mac 10
  • Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:21.0) Gecko/20100101 Firefox/21.0
    Firefox 21 on Mac 10
  • Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_0) Gecko/20131812 Firefox/21.0
    Firefox 21 on Mac 10
  • Mozilla/5.0 (Macintosh; Intel Mac OS X 11_8_5) Gecko/20161605 Firefox/21.0
    Firefox 21 on Mac 11
  • Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_1) Gecko/20020706 Firefox/21.0
    Firefox 21 on Mac 10
  • Mozilla/5.0 (X11; OpenBSD amd64; Linux x86_64; rv:21.0) Gecko/20130331 Firefox/21.0
    Firefox 21 on OpenBSD
  • Mozilla/5.0 (X11; Ubuntu; Linux x8664; rv:21.0) Gecko/20100101 Firefox/21.0
    Firefox 21 on Ubuntu
  • Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:21.0) Gecko/20100101 Firefox/21.0
    Firefox 21 on Ubuntu
  • Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0 AlexaToolbar/alxf-2.18
    Firefox 21 on Windows 7
  • Mozilla/5.0 (Windows NT 6.1; rv:21.0) Gecko/20100101 Firefox/21.0 AlexaToolbar/pEsyTp9f-2.1
    Firefox 21 on Windows 7
  • Mozilla/5.0 (Windows NT 6.1; rv:21.0) Gecko/20100101 Firefox/21.0 YB/5.2.2
    Firefox 21 on Windows 7
  • Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0 AlexaToolbar/pTu0fm0f-2.2
    Firefox 21 on Windows 7
  • Mozilla/5.0 (Windows NT 6.1; rv:21.0) Gecko/20100101 Firefox/21.0 AlexaToolbar/p9X2PIff-2.1
    Firefox 21 on Windows 7
  • Mozilla/5.0 (Windows; U; Windows NT 6.1; en-GB; rv:1.9.2.13) Gecko/20101203 Firefox/21
    Firefox 21 on Windows 7
  • Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0 BLNGBAR
    Firefox 21 on Windows 7
  • Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0 AlexaToolbar/p35OJT8f-2.1
    Firefox 21 on Windows 7
Random User Agents