Examine source code of Dark fadded fox

{
  "theme": {
    "images": {
      "theme_frame": "1header-333.jpg"
    },
    "colors": {
      "frame": "#333333",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Dark fadded fox",
  "manifest_version": 2,
  "description": "Simple dark skin with the faded fox in the top corner to better differentiate Firefox from other browsers when multitasking of doing cross-browser QA"
}