Sidebar Display Request

Great app!

I'm migrating to Firefox from Opera 12 and enjoy how closely the X-notifier sidebar resembles the Opera Mail tab.

One thing I'd like to request is that the 'X-notifier' text on top of the sidebar to only turn bold when there is mail in any of the registered email accounts.  As of now, it's bold all the time which sometimes makes me think I have email (Opera Mail (specifically the Unread and Received 'folders' only turned bold in the same area when mail as present).

It's a tiny request, but it'd be great if you could add it.

Thank you.