Required some features

I have tried seed4.me from long time and still our sessions can be detected by ipv6. So if ipv6 is not disabled in main internet adapter then whatismyip can easily detects current ip despite of vpn is enabled. So this must be solved. And it is advisable to make browser extension for mozilla and google chrome so wide range of people can try this. In browser extension there must be free mode and paid mode with profile login. Hotspot shield is best example of this.