Examine source code of Yellow Dice

{
  "theme": {
    "images": {
      "theme_frame": "dicethemecopy.jpg"
    },
    "colors": {
      "frame": "#f8ff29",
      "tab_background_text": "#e6ff00"
    }
  },
  "version": "2.0",
  "name": "Yellow Dice",
  "manifest_version": 2,
  "description": "I just wanted a simple yellow dice theme for my browser to wear - nothing really special."
}