Examine source code of Leather Binding

{
  "theme": {
    "images": {
      "theme_frame": "leather1_header.jpg"
    },
    "colors": {
      "frame": "#c9c9c9",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Leather Binding",
  "manifest_version": 2,
  "description": "A leather bound notebook to keep your innermost thoughts in... for your browser! Enjoy!"
}