Hey @Rishabh Sharma are you trying to open the 8888 or the 8080?
If you are not able to open the 8080, please check if there's some service running on 8080, try this:
netstat -tulpn | grep 8080
And if you're using VirtualBox be attempt to the network configs, and for Docker see if the ports are being redirected correctly.
Hope this helps 🙂