Review for Silvermel by mat8iou
Rated 5 out of 5 stars
A great theme, both in the Firefox & Thunderbird versions.
In the latest Thunderbird, there is a slight glitch that the "filter these messages" box seems to float over other windows if the window its in is too small, but that's the only problem I've noticed with it.
To create your own collections, you must have a Mozilla Add-ons account.