Brings the best feature from Inbox to Gmail – Sunshine when there is no new mail!
Now that the Google Inbox is being discontinued, we are forced to go back to using the old Gmail.
However, the most important feature is missing -- the great feeling of seeing the sun when you have successfully gone through all your incoming email and have no more work to do.
This extension solves this issue.
Source code at https://github.com/petrsloup/gmail-sunshine