192.168.50.10 192.168.1.3 icmp Allow ICMP to PrivateNetworks
let out anything from firewall host itself
You'll need a rule on the switch vlan that allows taking to the default LAN. Other than the default LAN there are no outbound rules on newly created VLANs.
It sounds like you have not configured the new switch with a default route (gateway) pointing to the firewall (probably 192.168.1.1).