Mozilla will offer a virtual private network (VPN) service to a small group of Firefox users. The service will cost $10/10/month, which matches ProtonVPNs regular monthly price for their service. Mozilla will promote and service user subscriptions, and Proton VPN will fulfill the VPN service and provide technical support. The VPN can be easily turned on or off as needed, and the subscription can be cancelled at any time. Windows, macOS, Linux, iOS, and Android are all supported.”]
Source: https://blog.mozilla.org/futurereleases/2018/10/22/testing-new-ways-to-keep-you-safe-online/