Examine source code of very damn dark

{
  "name": "Dark",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "grey.png"
    },
    "colors": {
      "frame": "rgba(40, 40, 40, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "bookmark_text": "rgba(82, 82, 82, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1c6a6a29-01ce-41a7-b440-756360066968}"
    }
  }
}