Examine source code of night girl

{
  "theme": {
    "images": {
      "theme_frame": "girl_night_header.jpg"
    },
    "colors": {
      "frame": "#a8a8a8",
      "tab_background_text": "#cf88d4"
    }
  },
  "version": "2.0",
  "name": "night girl",
  "manifest_version": 2
}