"If your only need for a VPN is to keep you encrypted when using public Wi-Fi and streaming a little overseas television, then grabbing a free VPN can pay dividends."
I didn't see reviews for the firefox VPN, but here's the link for anyone who might be interested to the (other) best free VPNs:
The Best Free VPN Services in 2020
at the link:
WireGuard was pulled into the Linux kernel 5.6 source tree so it's only a matter of time before after-market VPN providers aren't even really needed anymore.