Examine source code of Sneaking Shadows

{
  "theme": {
    "images": {
      "theme_frame": "Fox4colPUD3000.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#a4a6a3"
    }
  },
  "version": "2.0",
  "name": "Sneaking Shadows",
  "manifest_version": 2,
  "description": "Sneaking Shadows"
}