Examine source code of Blue Darkness

{
  "theme": {
    "images": {
      "theme_frame": "darkness.jpg"
    },
    "colors": {
      "frame": "#5644a6",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Blue Darkness",
  "manifest_version": 2,
  "description": "Edgy, grainy hues of blue depicting what seems to be spooky branches of a tree, this is the perfect persona to compliment your Firefox. If you like the color blue, that is."
}