Verified on Firefox 13.0.2 (Firefox 13 is the first one with 13.0.x versions 
since this bug was fixed). The User Agent for Fx13.0.2 is:
Mozilla/5.0 (Windows NT 6.1; rv:13.0) Gecko/20100101 Firefox/13.0.2

The UAs for other current versions are:
Mozilla/5.0 (Windows NT 6.1; rv:14.0) Gecko/20100101 Firefox/14.0
Mozilla/5.0 (Windows NT 6.1; rv:15.0) Gecko/20120708 Firefox/15.0a2
Mozilla/5.0 (Windows NT 6.1; rv:16.0) Gecko/16.0 Firefox/16.0

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https://bugs.launchpad.net/bugs/934887

Title:
  Firefox user-agent string is too unique

Status in The Mozilla Firefox Browser:
  Fix Released
Status in “firefox” package in Ubuntu:
  Triaged

Bug description:
  As shown on http://panopticlick.eff.org

  The useragent string "Mozilla/5.0 (X11; Ubuntu; Linux x86_64;
  rv:10.0.2) Gecko/20100101 Firefox/10.0.2" is too unique and in
  combination with a fairly unique plugin list this allows browser
  fingerprint tracking, which is bad for privacy.

  I would suggest this change:
  Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:10.0.2) Gecko/20100101 
Firefox/10.0.2
  Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:10.0) Gecko/20100101 Firefox/10.0

  This removes makes the version number less unique. Also the Gecko
  version could be made a bit more generic.

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