Examine source code of Silk Shadows

{
  "theme": {
    "images": {
      "theme_frame": "ffheadergrey.jpg"
    },
    "colors": {
      "frame": "#332f2f",
      "tab_background_text": "#8f8f8f"
    }
  },
  "version": "2.0",
  "name": "Silk Shadows",
  "manifest_version": 2,
  "description": "Silk Shadows. The first in the Shadows series."
}