Examine source code of Abstract Leather

{
  "theme": {
    "images": {
      "theme_frame": "Leather.jpg"
    },
    "colors": {
      "frame": "#faf5f5",
      "tab_background_text": "#c7c7d6"
    }
  },
  "version": "2.0",
  "name": "Abstract Leather",
  "manifest_version": 2,
  "description": "Firefox logo"
}