Examine source code of Numix Grey (ubuntu)

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#b3b3b3",
      "tab_background_text": "#e0e0e0"
    }
  },
  "version": "2.0",
  "name": "Numix Grey (ubuntu)",
  "manifest_version": 2,
  "description": "For the numix theme in ubuntu."
}