Examine source code of Target Practice in Gray

{
  "theme": {
    "images": {
      "theme_frame": "Target1.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#999999"
    }
  },
  "version": "2.0",
  "name": "Target Practice in Gray",
  "manifest_version": 2,
  "description": "Gray concentric circle pattern, much like an archery target (just in gray and black)!"
}