Examine source code of Mysterious Cat Dark

{
  "manifest_version": 2,
  "version": "1.4",
  "name": "Mysterious Cat Dark",
  "description": "A version of the Mysteriously Cat ***** addon with a dark new tab page and menus.",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "toolbar": "rgba(255, 255, 255, 0.3)",
      "toolbar_text": "#F0F0F0",
      "frame": "rgb(0, 28, 60)",
      "frame_inactive": "rgba(0, 28, 60, 1)",
      "tab_background_text": "#FFFFFF",
      "toolbar_field": "rgba(0, 0, 0, 0.5)",
      "toolbar_field_text": "#C8C8CE",
      "tab_line": "#8EB3C9",
      "popup": "#303030",
      "popup_text": "#C8C8CE",
      "ntp_background": "#202020",
      "ntp_text": "#C8C8CE",
      "sidebar_border": "#404040",
      "sidebar_highlight": "#303030",
      "sidebar_text": "#C8C8CE",
      "sidebar": "#303030",
      "tab_background_separator": "#000000",
      "toolbar_field_border_focus": "#A0A0A0",
      "toolbar_field_focus": "rgba(0, 0, 0, 0.6)"
    }
  }
}