There are some references to Firefox in the icecat-l10n deb tarball, that are shown in the about window.
They can be set to empty strings with the script at the end of this: http://bzr.trisquel.info/package-helpers/helpers/natty/make-icecat-l10n The rest of the helper just puts the script in place and generates a set of transitional packages providing firefox-locale-$LANG. -- http://gnuzilla.gnu.org
