Latest Iceweasel 7 user agents:

User Agent Platform Device
Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20100101 Firefox/7.0.1 Iceweasel/7.0.1 Debian Debian Unknown
Mozilla/5.0 (X11; Linux i686; rv:7.0.1) Gecko/20100101 Firefox/7.0.1 Iceweasel/7.0.1 GNU/Linux Unknown
Mozilla/5.0 (X11; Linux i686; rv:7.0.1) Gecko/20100101 Debian Iceweasel/7.0.1 Debian Unknown
Mozilla/5.0 (X11; Linux i686; Debian Testing; rv:7.0.1) Gecko/20100101 Firefox/7.0.1 Iceweasel/7.0.1 Debian Unknown
Mozilla/12.0 (X11; Linux i686; rv:7.0.1) Gecko/20100101 Debian Iceweasel/7.0.1 Debian Unknown