Firefox keeps telling me about a VPN, but I cannot find this or any way to use which corresponds to what I see on the screen. Help says "sign in with a Mozilla account", but I don't know what this means. Sign into what? Looking at the Mozilla site there is no way to register or create an account or tell if I already have one. I've signed up to emails etc but find no difference when I use Firefox. It qualifies - verions and UK - what am I missing?