Examine source code of Nighttime - Dark Blue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Nighttime",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(51, 46, 67, 0.76)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(42, 49, 50)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(66, 72, 159)",
      "tab_line": "rgba(112, 201, 248, 0.4)",
      "popup": "rgb(52, 53, 71)",
      "popup_text": "rgb(253, 253, 253)",
      "button_background_active": "rgb(127, 122, 162)",
      "button_background_hover": "rgb(52, 53, 71)",
      "icons_attention": "rgb(178, 9, 9)",
      "icons": "rgba(179, 182, 200, 0.79)",
      "ntp_background": "rgb(45, 45, 61)",
      "popup_border": "rgba(119, 108, 178, 0.67)",
      "popup_highlight": "rgba(19, 21, 39, 0.79)",
      "tab_background_separator": "rgb(146, 152, 201)",
      "toolbar_bottom_separator": "rgb(136, 131, 154)",
      "toolbar_field_border": "rgb(255, 255, 255)",
      "toolbar_field_highlight_text": "rgb(29, 22, 57)",
      "toolbar_field_separator": "rgb(157, 147, 193)",
      "toolbar_field_text_focus": "rgb(41, 34, 84)",
      "toolbar_top_separator": "rgba(255, 255, 255, 0)",
      "toolbar_vertical_separator": "rgba(119, 108, 178, 0.67)",
      "tab_loading": "rgba(112, 201, 248, 0.4)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{716919b2-dfc8-46ab-98de-9b05d52981df}"
    }
  }
}