For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:manfred999/openSUSE_Tumbleweed/home:manfred999.repo
zypper refresh
zypper install firewall-config
For openSUSE Factory PowerPC run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:manfred999/openSUSE_Factory_PowerPC/home:manfred999.repo
zypper refresh
zypper install firewall-config
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:manfred999/openSUSE_Factory_ARM/home:manfred999.repo
zypper refresh
zypper install firewall-config
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:manfred999/15.6/home:manfred999.repo
zypper refresh
zypper install firewall-config