I've used Hoxx for two years now, and can confirm that it works very well and is 100% free. There are no privacy risks with it, and certainly no viruses. It will protect your IP, and you can connect to tons of servers in different countries from the United States to Lithuania. Getting Premium is not required and there is even a free trial before you get it, and they will not pressure you to buy it very much. They also have desktop clients and a mobile app, which all work very well on top of this extension. You also should combine this VPN with their WebRTC blocker which will protect your IP through another layer of protection. Highly suggested VPN for free-use, probably the best free VPN as an extension. It also has very high speeds, which you can speedtest. 10/10.