UA: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20121201 icecat/17.0.1
Protocol: HTTP/1.1
Robots.txt: No
Host: Various
IceCat, formerly named IceWeasel with upper-case W, is the GNU version of the Firefox browser. The main difference is: it is entirely free software. While the source code from the Mozilla project is free software, the binaries that they release include additional non-free software.