Comment 4 for bug 1864517

This is still an issue for the dashboard. This is to support discharging a login macaroon vs user/pass authentication. There are two reasons this would be good for the Dashboard:

1. At the moment any visit to the dashboard or refreshing the page requires the user to log in again.

2. The dashboard supports adding additional controller which requires storing the username and password in local storage, with macaroon auth we wouldn't need to keep hold of the user's creds.