Gnuzilla is the GNU version of the Mozilla suite, and GNU IceCat is the GNU version of the Firefox browser. Its main advantage is an ethical one: 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. Also, they distribute and recommend non-free software as plug-ins.
from: www [dot] gnu [dot] org / software / gnuzilla
recently i got working a BLAG 70000 system (great system) and i got a question;
if icecat is more free, why firefox is by default in blag?