Firefox recently added a free built-in VPN to its desktop browser, but access to the feature is rolling out gradually. I got the prompt on my Ubuntu machine last night, so here’s a rundown of what it actually does, what it doesn’t, and how to set it – assuming you have it. If you’re waiting for it to roll out to you, there’s no special update or download to look out for as this is a progressive rollout feature – Mozilla enables it remotely, in stages. There was no fanfare when it arrived for me, the toolbar button just appeared. […]