I highly suggest you to update your copy of IceCat to the latest one,
several security problems were fixed in this release.
Here are the GNU IceCat files:
ftp://ftp.gnu.org/gnu/gnuzilla/2.0.0.12-g1/icecat-2.0.0.12-g1.tar.lzma
ftp://ftp.gnu.org/gnu/gnuzilla/2.0.0.12-g1/icecat-2.0.0.12-g1-i386.tar.lzma
MD5 and SHA1 checksums:
b19baac05dcb624a630c15da5d9f87c4 icecat-2.0.0.12-g1-i386.tar.lzma
15253abaa720c2c4674b91c801ad6144 icecat-2.0.0.12-g1.tar.lzma
d06c5e5626cae87c522a881db1c700664d0f5dc6 icecat-2.0.0.12-g1-i386.tar.lzma
135e8f20c3f0b5b03a84d68be4f6e5faaa9944c0 icecat-2.0.0.12-g1.tar.lzma
Have fun!