Examine source code of Da Vinci themed

{
  "theme": {
    "images": {
      "theme_frame": "persona-jpeg.jpg"
    },
    "colors": {
      "frame": "#c4c4c4",
      "tab_background_text": "#a3a3a3"
    }
  },
  "version": "2.0",
  "name": "Da Vinci themed",
  "manifest_version": 2,
  "description": "Da Vinci themed."
}