Examine source code of Volcano

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Volcano",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(33, 40, 42, 0.7)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(33, 40, 42)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(33, 40, 42, 0.8)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(242, 81, 52, 0.6)",
      "popup": "rgb(33, 40, 42)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(242, 81, 52)",
      "button_background_hover": "rgb(242, 81, 52)",
      "frame_inactive": "rgba(33, 40, 42, 0.8)",
      "icons_attention": "rgb(255, 255, 255)",
      "icons": "rgb(255, 255, 255)",
      "ntp_background": "rgb(28, 34, 36)",
      "ntp_text": "rgb(255, 255, 255)",
      "popup_border": "rgb(33, 40, 42)",
      "popup_highlight_text": "rgb(242, 81, 52)",
      "popup_highlight": "rgb(28, 34, 36)",
      "sidebar_border": "rgb(242, 81, 52)",
      "sidebar_highlight_text": "rgb(242, 81, 52)",
      "sidebar_highlight": "rgb(28, 34, 36)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(33, 40, 42)",
      "tab_background_separator": "rgb(0, 198, 255)",
      "tab_loading": "rgb(0, 198, 255)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgb(33, 40, 42)",
      "toolbar_field_border_focus": "rgb(242, 81, 52)",
      "toolbar_field_border": "rgb(33, 40, 42)",
      "toolbar_field_focus": "rgb(33, 40, 42)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgb(242, 81, 52)",
      "toolbar_field_separator": "rgb(0, 198, 255)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgb(33, 40, 42)",
      "toolbar_vertical_separator": "rgb(242, 81, 52)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4e7bb6f0-5795-40f1-8bcc-9cf16780fec8}"
    }
  }
}