Examine source code of darkgreen basic

{
  "theme": {
    "images": {
      "theme_frame": "firefoxdeepgreen.JPG"
    },
    "colors": {
      "frame": "#395437",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "darkgreen basic",
  "manifest_version": 2,
  "description": "A dark green gradient with shades ranging from very dark (almost black) green to forest green."
}