Latest Iceweasel 32 user agents:

User Agent Platform Device
Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0 Iceweasel/32.0a2 GNU/Linux Unknown
Mozilla/5.0 (X11; Linux i686 on x86_64; rv:32.0) Gecko/20100101 Firefox/32.0 Iceweasel/32.0.3 GNU/Linux Unknown
Mozilla/5.0 (X11; Linux i686 on x86_64; rv:32.0) Gecko/20100101 Firefox/32.0 Iceweasel/32.0 GNU/Linux Unknown