Examine source code of darkwood

{
  "name": "dark wood",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "dark-back.jpg"
    },
    "colors": {
      "frame": "rgba(50, 51, 51, 1)",
      "tab_background_text": "rgba(214, 210, 210, 0.85)",
      "toolbar": "rgba(54, 54, 54, 0.49)",
      "bookmark_text": "rgba(245, 245, 245, 1)",
      "toolbar_field": "rgba(15, 15, 15, 0.78)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)"
    }
  }
}