Examine source code of Holiday Besties

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#d6d1c0",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Holiday Besties",
  "manifest_version": 2,
  "description": "Happy Halloween\n\n\ncat, owl, moon"
}