Ember Simple Auth
A library for implementing authentication/authorization in Ember.js
...With its pluggable strategies it can support all kinds of authentication and authorization mechanisms. it maintains a client-side session and synchronizes its state across multiple tabs/windows of the application. it authenticates the session against the application's own server, external providers like Facebook etc. The session service is the main interface to the library. It provides methods for authenticating and invalidating the session as well as for setting and reading session data. The session store persists the session state so that it survives a page reload. It also synchronizes the session state across multiple tabs or windows of the application so that e.g. a logout in one tab or window also results in a logout in all other tabs or windows of the application.