Can't figure out how to use angularfire-multi-auth?

Question

Angular

Good day. I have a task: In an AngularJS web application, it is necessary to implement login through social networks. At the same time, you need to make sure that a user with several social networks has the opportunity to link several different social networks and change the email in his account. However, it must be one account.
There is such a thing ( https://github.com/douglascorrea/angularfire-multi... which, judging by the description, fully implements what I need, but I could not make friends with it. If anyone used or understood, please tell me how to apply it correctly.Unfortunately, I did not find examples of use.