Examine source code of Cool Colosseum

{
  "theme": {
    "images": {
      "theme_frame": "coolcolosseum2.jpg"
    },
    "colors": {
      "frame": "#ff0000",
      "tab_background_text": "#ff8000"
    }
  },
  "version": "2.0",
  "name": "Cool Colosseum",
  "manifest_version": 2,
  "description": "The Roman Colosseum. (So Cool)"
}