The '''about:config''' preference '''browser.ipProtection.enabled''' controls if the VPN button shows up or not. Most likely it's set to false. Toggling it to '''true''' should turn it on. Apparently it is on a progressive roll-out. Here's a Reddit thread that talks about it: https://www.reddit.com/r/firefox/comments/1s2ik4l/introducing_firefoxs_builtin_vpn_ip_protection/ Mine still has the value set to false by default.