No, this isn’t the name of some low budget action film, this is one of the coolest new themes that right now only works with Firefox 2. Here is a little more of a description from the folks who created it.
ShadowThunder’s personal touches onto a combination of la crème de la crème (the best of the best). Pretty and pleasant icons on a cool, blue background designed to be soft on the eyes.
This is a nice sample of what is to come with new and updated Firefox themes.