Opera's free VPN, like all VPNs, is a poor choice. It's not even really a VPN, just a proxy. They collect all your traffic and data, keep logs, and use it to serve you targeted ads: https://www.opera.com/privacy. Have a read of this: https://thatoneprivacysite.net/blog/operas-baked-in-vpn-is-not-a-good-solution-for-your-privacy/

There is no such thing as a truly free VPN. If it is free, then you are the product. As I said above, companies which provide free VPNs are making there money from selling your data, and this makes you less private, not more.

Why would you use a Tor plug-in in a browser with poor security which lies about being privacy focused, when you could just cut out the middle-man and use the Tor browser?