Examine source code of pretty rainbow

{
  "theme": {
    "images": {
      "theme_frame": "Persona.jpg"
    },
    "colors": {
      "frame": "#09f225",
      "tab_background_text": "#1c0999"
    }
  },
  "version": "2.0",
  "name": "pretty rainbow",
  "manifest_version": 2,
  "description": "colorful....."
}