Examine source code of Dark Leather

{
  "theme": {
    "images": {
      "theme_frame": "leather.jpg"
    },
    "colors": {
      "frame": "#1e1e1e",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Dark Leather",
  "manifest_version": 2,
  "description": "For those rugged biker types you can't stand anything not covered in leather. You know who you are."
}