Impossible to browse web after configuring iptables

I'm trying to configure iptables on my ubuntu computer. These are my rules:

Chain INPUT (policy DROP)
target     prot opt source               destination         
ACCEPT     tcp  --  anywhere             anywhere             tcp    dpt:https
ACCEPT     tcp  --  anywhere             anywhere             tcp  dpt:http
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:domain
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:ftps-data
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:ftps

Chain FORWARD (policy DROP)
target     prot opt source               destination         
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:https
ACCEPT     tcp  --  anywhere             anywhere             tcp     dpt:http
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:domain

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination    

Unfortunately, when I try to use the web explorer, it can not connect. Just a blank page continuously trying to load. I tried sending a ping to www.google.com, but the connection can not be established. Maybe should I leave more ports open?

Thank you very much for you help!!!