Examine source code of Napoleon - David

{
  "theme": {
    "images": {
      "theme_frame": "NapoleonHeader.png"
    },
    "colors": {
      "frame": "#8c8c8c",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Napoleon - David",
  "manifest_version": 2,
  "description": "This image uses the painting of Napoleon by Jacques Louis David. The painting is a bit small but I may make it a little bigger in a different version."
}