firefox is no shell wrapper anymore but rather (almost?) a copy of firefox-bin and therefore package it
#!/bin/sh
# Finds requirements provided outside of the current file set
filelist=$( sed "s/[]['\"*?{}]/\\\\\&/g" )
provides=$( echo "$filelist" | /usr/lib/rpm/find-provides )
echo "$filelist" \
| /usr/lib/rpm/find-requires \
| grep -F -v "$provides" \
| sort -u