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 (X11; FreeBSD amd64; rv:21.0) Gecko/20130331 Firefox/21.0

    Firefox 21 on FreeBSD

  • Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20100101 Firefox/21.0

    Firefox 21 on Windows 7

  • Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:21.0) Gecko/20100101 Firefox/21.0

    Firefox 21 on Mac 10

  • Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:21.0) Gecko/20100101 Firefox/21.0

    Firefox 21 on Mac 10

  • Mozilla/5.0 (Windows NT 6.0; rv:21.0) Gecko/20100101 Firefox/21.0 AlexaToolbar/amznf-3.0.20121129

    Firefox 21 on Windows Vista

  • Mozilla/5.0 (Windows NT 6.0; rv:21.0) Gecko/20130331 Firefox/21.0

    Firefox 21 on Windows Vista

  • Mozilla/5.0 (Windows NT 6.0; rv:21.0) Gecko/20100101 Firefox/21.0

    Firefox 21 on Windows Vista

  • Mozilla/5.0 (Windows NT 4.0; rv:21.0) Gecko/20100101 Firefox/21.0

    Firefox 21 on Windows NT

  • Mozilla/5.0 (Windows NT 4.10; rv:21.0) Gecko/20100101 Firefox/21.0

    Firefox 21 on Windows NT

  • Mozilla/5.0 (Windows NT 6.2; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0 AlexaToolbar/alxf-2.18

    Firefox 21 on Windows 8

  • Mozilla/5.0 (Windows NT 6.2; rv:21.0) Gecko/20130207 Firefox/21.0

    Firefox 21 on Windows 8

  • Mozilla/5.0 (Windows NT 6.2; WOW64; rv:21.0) Gecko/20130213 Firefox/21.0

    Firefox 21 on Windows 8

  • Mozilla/5.0 (Windows NT 6.2; WOW64; rv:21.0; Avant TriCore) Gecko/20130618 Firefox/21.0

    Firefox 21 on Windows 8

  • Mozilla/5.0 (Windows NT 6.2; Win64; x64; rv:21.0) Gecko/20100101 Firefox/21.0

    Firefox 21 on Windows 8

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

    Firefox 21 on Windows 8

  • Mozilla/5.0 (Windows NT 6.3; Win64; x64) Gecko/20031504 Firefox/21.0

    Firefox 21 on Windows 8

  • Mozilla/5.0 (Windows NT 6.3; Win64; x64) Gecko/20112003 Firefox/21.0

    Firefox 21 on Windows 8

  • Mozilla/5.0 (Windows NT 6.3; WOW64) Gecko/20142805 Firefox/21.0

    Firefox 21 on Windows 8

  • Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0 IABrowser368a0a47746

    Firefox 21 on Windows 7

  • Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:21.0) Gecko/20130210 Firefox/21.0

    Firefox 21 on Windows 7

  • Mozilla/5.0 (Windows NT 6.1; rv:21.0) Gecko/20130110 Firefox/21.0

    Firefox 21 on Windows 7

  • Mozilla/5.0 (Windows NT 6.1; rv:21.0) Gecko/20130108 Firefox/21.0

    Firefox 21 on Windows 7

  • Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20130308 Firefox/21.0

    Firefox 21 on Windows 7

  • Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:21.0) Gecko/20130125 Firefox/21.0

    Firefox 21 on Windows 7

  • Mozilla/5.0 (Windows NT 6.1; rv:21.0) Gecko/20130121 Firefox/21.0

    Firefox 21 on Windows 7

  • Mozilla/5.0 (Windows NT 6.1; rv:21.0) Gecko/20130213 Firefox/21.0

    Firefox 21 on Windows 7

  • Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20130210 Firefox/21.0

    Firefox 21 on Windows 7

  • Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20130207 Firefox/21.0

    Firefox 21 on Windows 7

  • Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20130127 Firefox/21.0

    Firefox 21 on Windows 7

  • Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:21.0) Gecko/20130109 Firefox/21.0

    Firefox 21 on Windows 7

  • Mozilla/5.0 (Windows NT 6.1; rv:16.0.1) Gecko/20121011 Firefox/21.0 (for p.pform.net)

    Firefox 21 on Windows 7

  • Mozilla/5.0 (Windows NT 6.1; rv:21.0) Gecko/20130328 Firefox/21.0

    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

  • 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; 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; rv:21.0) Gecko/20100101 Firefox/21.0 AlexaToolbar/p9X2PIff-2.1

    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 YB/5.2.2

    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; 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; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0,gzip(gfe)

    Firefox 21 on Windows 7

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

    Firefox 21 on Ubuntu

  • Mozilla/5.0 (X11; Ubuntu; Linux x8664; rv:21.0) Gecko/20100101 Firefox/21.0

    Firefox 21 on Ubuntu

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

    Firefox 21 on OpenBSD

  • Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_1) Gecko/20020706 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_0) Gecko/20131812 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 10.6; 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

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