There are not many green themes for Firefox that I would consider using – however Devious Green might be one of the few I add to my list of themes you have to at least try – if you love browsing in the shade of money, grass and ummm… other green things.
The theme is based off the look and feel of the web site DeviantART – and pulls off it’s style very well. One place where some might have problems is the icons are a little jagged – because, they are on DeviantART’s web site too. As the author says, “Toolbar icons are in the DA .gif emoticon styles, jagged edges on purpose, so please don’t complain about that.”
You can pick up the Devious Green theme for Firefox via the Firefox add-ons site.