One of the most annoying things about the Outlook Web App is the fact that you have to navigate to the page's tab to check how many unread messages you have in your inbox. This extension appends the unread message count to the Outlook Web App's tab text.
Please add the blue icon https://outlook.office365.com/owa/#path=/mail support.
There are also the
shared folderswith another display format and url https://outlook.office365.com/owa/(shared@mail.address)/#path=/mail.