Examine source code of Sea Green Firefox

{
  "theme": {
    "images": {
      "theme_frame": "firefox-green-8.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Sea Green Firefox",
  "manifest_version": 2,
  "description": "Made entirely using The Gimp under Ubuntu 9.04. I got the Firefox logos from Firefox's spread the word site and created the blue / green effect using large sweeping brush strokes with low opacity and then a couple of noise layers on top."
}