Examine source code of Smooth Shadows

{
  "theme": {
    "images": {
      "theme_frame": "joest1_header.jpg"
    },
    "colors": {
      "frame": "#a8a8a8",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Smooth Shadows",
  "manifest_version": 2,
  "description": "Stylish shadows on a business like abstract background. Subtle structure in the background. Have fun!"
}