Review for Additional Folder Views by MRFREEZE
Rated 5 out of 5 stars
Simple, Perfect extension - without trying to be over ambitious. Just what I was looking for - A summary of all my folders across all of my accounts which have unread messages in them. Please "legege" keep this extension up to date and working with all future versions of T-Bird - it's now a must have extension. (Working fine for me Under 2.0.0.21)
To create your own collections, you must have a Mozilla Add-ons account.