Examine source code of giant polka party

{
  "theme": {
    "images": {
      "theme_frame": "giantpolkadotparty.jpg"
    },
    "colors": {
      "frame": "#0d0d0d",
      "tab_background_text": "#0cf579"
    }
  },
  "version": "2.0",
  "name": "giant polka party",
  "manifest_version": 2,
  "description": "big multicolored polka dots"
}