Examine source code of Picasso window

{
  "theme": {
    "images": {
      "theme_frame": "Untitled-1.png"
    },
    "colors": {
      "frame": "#339410",
      "tab_background_text": "#339410"
    }
  },
  "version": "2.0",
  "name": "Picasso window",
  "manifest_version": 2,
  "description": "Paintings from Picasso"
}