Examine source code of Be green

{
  "theme": {
    "images": {
      "theme_frame": "enca-begreenbueno.png"
    },
    "colors": {
      "frame": "#524f4f",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Be green",
  "manifest_version": 2,
  "description": "Be green, save the planet!\nGreen trees on a blue background"
}