Examine source code of fadetoblack

{
  "name": "fadetoblack",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "rrrBlack_for_Big_Style_Dot_shop_thumb.png"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(179, 179, 179, 1)",
      "toolbar": "rgba(17, 17, 17, 1)",
      "bookmark_text": "rgba(179, 179, 179, 1)",
      "toolbar_field": "rgba(0, 0, 0, 1)",
      "toolbar_field_text": "rgba(179, 179, 179, 1)",
      "tab_line": "rgba(17, 17, 17, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4a4e1491-7ae4-4cdb-9bb7-15fdff8ce216}"
    }
  }
}