Examine source code of atman21

{
  "theme": {
    "images": {
      "theme_frame": "sunset3.jpg"
    },
    "colors": {
      "frame": "#699950",
      "tab_background_text": "#423c34"
    }
  },
  "version": "2.0",
  "name": "atman21",
  "manifest_version": 2,
  "description": "Saltburn sunset "
}