Today I gave fwbuilder Firewall Builder 3.0.3 a try. It's nice!
Thanks to vk999!
What I want to bring to your knowledge is the following:
The policy importer for iptables policies is working only, if you safe your firewall rules without the -c option!
Working:
iptables-safe > iptables.config
Not working:
iptables -c > iptables.config