Looking for logging into the Firebaseui site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Firebaseui site. After that you can login as usual with your login credentials.
https://firebase.google.com/docs/auth/web/firebaseui?hl=ja
https://firebase.google.com/docs/auth/ios/firebaseui?hl=ja
https://firebase.google.com/docs/auth/android/firebaseui?hl=ja
https://qiita.com/musatarosu/items/5411772d97f72d00d267
https://github.com/firebase/firebaseui-web
https://github.com/firebase/FirebaseUI-Android/tree/master/auth
http://flatlevel56.blogspot.com/2016/12/firebaseui.html
http://tech.innovation.co.jp/2018/02/26/Firebae-Ui.html
http://uphy.hatenablog.com/entry/2017/11/05/102234