Make variable accessible

src/freedombone-utils-firewall

 FIREWALL_DOMAINS=$HOME/${PROJECT_NAME}-firewall-domains.cfg
 FIREWALL_EIFACE=eth0
 EXTERNAL_IPV4_ADDRESS=
+FIREFOX_TELEMETRY_IP='52.88.27.118'
 
 function save_firewall_settings {
     iptables-save > /etc/firewall.conf
     # to be on the safe side
     # Within firefox source code see submit_telemetry_data.py
 
-    FIREFOX_TELEMETRY_IP='52.88.27.118'
-
     if grep "$FIREFOX_TELEMETRY_IP" /etc/firewall.conf; then
         return
     fi