Examine source code of Penguins_blackcircles

{
  "theme": {
    "images": {
      "theme_frame": "blackpenguins_web.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Penguins_blackcircles",
  "manifest_version": 2,
  "description": "Two penguins in love.\nBlack background with circles and lines.\nThe penguins are my design and are not to be used without my permission. Thanks."
}