How Fire Authentication is private?
Fire only generates a token and sends it to your website. And only your website can access the token and get your data. Fire does not collect any data from your users unlike the "telemetry" data by other services. You can always be sure that your data stays with you and what you do online is known by you alone.
How Fire works?
You, as a user, will generate a token by scanning a QR or clicking on an authorize link. Your token will be sent to the client website through web sockets. And only the website generated the QR or the link can access. Your device will generate only with an id which refers your account containing only your name and email so you can stay private.
How it is easy for developers to use Fire?
Developers have to do only one thing, they have to register for an API key and paste it inside a file which should be in the root of your project. And in your login page, using theBroadcast Channel API, you can get the token after which you will need to send it to Fire to get the users' data.