Examine source code of Pluto mix

{
  "theme": {
    "images": {
      "theme_frame": "DOG.png"
    },
    "colors": {
      "frame": "#f0ce0e",
      "tab_background_text": "#f0780e"
    }
  },
  "version": "2.0",
  "name": "Pluto mix",
  "manifest_version": 2
}