No Facebook SDK
Plug.DJ will not work in Chrome if you have any extensions that block the Facebook SDK from loading, like Ghostery, Disconnect.me, ScriptSafe, or Privacy Badger. The Facebook SDK is used for the "Login With Facebook" functionality.
If you use Facebook to log in, you will have to add an exception for facebook.com in these extensions.
If you do not use Facebook, you can use this tiny userscript to inject a fake, non-functional Facebook object into the page before Plug.DJ tries to load the Facebook SDK. It will then use this empty one instead of the one on facebook.com. This way you can enjoy Plug.DJ without having to allow Facebook to track your every move.
plug-no-facebook.user.js