Examine source code of Gray Chronicles

{
  "theme": {
    "images": {
      "theme_frame": "Cabeceradgdfhd-Copy.jpg"
    },
    "colors": {
      "frame": "#e80000",
      "tab_background_text": "#870000"
    }
  },
  "version": "2.0",
  "name": "Gray Chronicles",
  "manifest_version": 2,
  "description": "..."
}