Examine source code of Barrel Strap

{
  "theme": {
    "images": {
      "theme_frame": "BarrelStrap.png"
    },
    "colors": {
      "frame": "#cfcbcb",
      "tab_background_text": "#0f0f0f"
    }
  },
  "version": "2.0",
  "name": "Barrel Strap",
  "manifest_version": 2,
  "description": "Simple Barrel Strap Design"
}