Add a notification to the favicon on the Office365 tab

[GermanKiwi]

Currently this extension adds a new icon to the Chrome toolbar, and when there is new mail, the icon displays a notification in its corner - like [1] or [2] etc.

It would be great if a similar notification could be displayed in the corner of the favicon that is displayed on the actual tab of Office365 - assuming such a tab is open at the time. Eg. mayve the extension can check if any tabs are open to https://outlook.office365.com and if so, it displays the notification on that tab when there is new mail. That helps the user to see at a glance that there is new mail waiting on that tab.

Especially helpful for when you pin the Office365 tab!