Examine source code of FireFox Shad

{
  "theme": {
    "images": {
      "theme_frame": "fox1.jpg"
    },
    "colors": {
      "frame": "#636363",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "FireFox Shad",
  "manifest_version": 2,
  "description": "This is my first work , hope you join it , Good luck and Thanks!"
}