Examine source code of Dark Journey

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark Journey",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg",
        "images/1.png",
        "images/2.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left bottom",
        "right top",
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat",
        "no-repeat",
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.34)",
      "toolbar_text": "rgb(208, 208, 208)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(212, 212, 212)",
      "toolbar_field": "rgba(255, 255, 255, 0)",
      "toolbar_field_text": "rgb(221, 216, 216)",
      "tab_line": "rgba(166, 0, 0, 0.76)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgba(174, 0, 0, 0.4)",
      "button_background_hover": "rgba(201, 201, 201, 0.5)",
      "frame_inactive": "rgb(0, 0, 0)",
      "icons": "rgb(255, 8, 0)",
      "ntp_background": "rgb(0, 0, 0)",
      "ntp_text": "rgba(255, 255, 255, 0.71)",
      "popup_border": "rgba(212, 0, 0, 0.71)",
      "popup_highlight_text": "rgb(255, 255, 255)",
      "popup_highlight": "rgba(159, 159, 159, 0.48)",
      "sidebar_border": "rgba(211, 0, 0, 0.48)",
      "sidebar_highlight_text": "rgb(255, 255, 255)",
      "sidebar_highlight": "rgba(165, 0, 0, 0.44)",
      "sidebar_text": "rgb(237, 237, 237)",
      "sidebar": "rgb(0, 0, 0)",
      "tab_loading": "rgba(230, 0, 0, 0.71)",
      "tab_selected": "rgba(219, 213, 213, 0.8)",
      "tab_text": "rgb(0, 0, 0)",
      "toolbar_bottom_separator": "rgb(215, 0, 0)",
      "toolbar_field_border_focus": "rgba(109, 0, 0, 0.76)",
      "toolbar_field_border": "rgba(0, 0, 0, 0)",
      "toolbar_field_focus": "rgba(0, 0, 0, 0)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgba(150, 0, 0, 0.72)",
      "toolbar_field_text_focus": "rgba(212, 212, 212, 0.89)",
      "toolbar_top_separator": "rgba(192, 192, 192, 0)"
    }
  }
}