Examine source code of Serenity

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Serenity",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(30, 11, 73, 0)",
      "toolbar_text": "rgb(181, 126, 220)",
      "frame": "rgb(33, 38, 49)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(51, 47, 87, 0.69)",
      "toolbar_field_text": "rgb(134, 126, 220)",
      "tab_line": "rgb(181, 126, 220)",
      "popup": "rgb(33, 38, 49)",
      "popup_text": "rgb(134, 126, 220)",
      "ntp_background": "rgb(33, 38, 49)",
      "popup_border": "rgba(0, 0, 0, 0)",
      "popup_highlight_text": "rgb(134, 126, 220)",
      "popup_highlight": "rgb(134, 126, 220)",
      "sidebar_border": "rgba(0, 0, 0, 0)",
      "sidebar_highlight_text": "rgb(134, 126, 220)",
      "sidebar_highlight": "rgb(33, 38, 49)",
      "sidebar_text": "rgb(181, 126, 220)",
      "sidebar": "rgb(33, 38, 49)",
      "toolbar_bottom_separator": "rgba(0, 0, 0, 0)",
      "toolbar_field_border_focus": "rgba(0, 0, 0, 0)",
      "toolbar_field_border": "rgba(0, 0, 0, 0)",
      "toolbar_field_focus": "rgb(51, 47, 87)",
      "toolbar_field_text_focus": "rgb(181, 126, 220)",
      "toolbar_top_separator": "rgba(95, 50, 198, 0)",
      "toolbar_vertical_separator": "rgba(0, 0, 0, 0)",
      "tab_loading": "rgb(181, 126, 220)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{014b43e2-8b16-4c93-846a-6434e45d53b0}"
    }
  }
}