Examine source code of Singing Cookie

{
  "theme": {
    "images": {
      "theme_frame": "persona2.png"
    },
    "colors": {
      "frame": "#290606",
      "tab_background_text": "#170101"
    }
  },
  "version": "2.0",
  "name": "Singing Cookie",
  "manifest_version": 2,
  "description": "A singing cookie"
}