Review for Nostalgy by Ric B
Rated 4 out of 5 stars
It took me a day or so to "get it", but now that I do I really like Nostalgy a lot.
It makes it so much faster and easier to move messages around using only the keyboard.
If T'bird is your primary email client (it's mine), I'd recommend installing Nostalgy and taking the time to learn how to use it -- you'll almost certainly like it, too...
To create your own collections, you must have a Mozilla Add-ons account.