If we talked about Browsers compatibility, Opera is one the best and lightest browser in the online market, Off course it has huge numbers of features and customization which no one has right now, but when we talked about Free VPN extension on Opera It's pretty cool but not the best choice that you can get.
People mostly consider to get VPN service to enhance their security and hide their visibility. More simply to understand is: when you download torrent file, it will download anonymously, but when you start seed it through Utorrent or Bittorrent it will go through Naked Internet Connection and visible.
VPN Encryption is the best solution for those guys (http://www.beencrypted.com/how-to-encrypt-internet-traffic/) in this guide you can see how you can Encrypt your internet traffic.
I would highly recommend to use full and 100% VPN Encryption instead of using Proxy or VPN extensions on web browsers. https://www.mostsecurevpn.com/cheap-vpn-services/