Examine source code of Simple Grey

{
  "theme": {
    "images": {
      "theme_frame": "simpleTOP.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#1c1c1c"
    }
  },
  "version": "2.0",
  "name": "Simple Grey",
  "manifest_version": 2,
  "description": "Just something simple. Enjoy."
}