Examine source code of Simple Diamonds

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#cad437",
      "tab_background_text": "#878787"
    }
  },
  "version": "2.0",
  "name": "Simple Diamonds",
  "manifest_version": 2,
  "description": "Blue and Black diamonds, pathetically crafted for my own use, since I was bored."
}