Examine source code of The Horde

{
  "name": "The Horde",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "banner.jpg"
    },
    "colors": {
      "frame": "rgba(20, 20, 20, 1)",
      "tab_background_text": "rgba(194, 194, 194, 1)",
      "toolbar": "rgba(102, 102, 102, 0.19)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(10, 10, 10, 0.85)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)"
    }
  }
}