Latest Iceweasel 36 user agents:

User Agent Platform Device
Mozilla/5.0 (X11; Linux i686; rv:36.0) Gecko/20100101 Firefox/36.0 Iceweasel/36.0 GNU/Linux Unknown
Mozilla/5.0 (X11; Linux x86_64; rv:36.0) Gecko/20100101 Firefox/36.0 Iceweasel/36.0.4 GNU/Linux Unknown
Mozilla/5.0 (X11; Linux x86_64; rv:36.0) Gecko/20100101 Firefox/36.0 Iceweasel/36.0 GNU/Linux Unknown