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Description of problem: When installing with: %packages --default firefox %end The resulting anaconda-ks.cfg file contains: %packages --default %end This is with anaconda-13.21.100-1.el6.x86_64. See bug #621349 for more information about this kickstart syntax.
firefox is marked as a default package, so there's no point in having it listed in the %packages section. It will automatically be pulled in by "--default". In this case, anaconda-ks.cfg should only list those packages marked as optional in comps.