Examine source code of castello24

{
  "theme": {
    "images": {
      "theme_frame": "castello24.png"
    },
    "colors": {
      "frame": "#107a5c",
      "tab_background_text": "#260e0e"
    }
  },
  "version": "2.0",
  "name": "castello24",
  "manifest_version": 2,
  "description": "this is a test"
}