Latest Iceweasel 35 user agents:

User Agent Platform Device
Mozilla/5.0 (X11; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0 Iceweasel/35.0a2 GNU/Linux Unknown
Mozilla/5.0 (X11; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0 Iceweasel/35.0 GNU/Linux Unknown
Mozilla/5.0 (X11; Linux i686; rv:35.0) Gecko/20100101 Firefox/35.0 Iceweasel/35.0 GNU/Linux Unknown