Examine source code of Smyth the myth

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "smyththemyth",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.38)",
      "toolbar_text": "rgb(230, 230, 230)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(225, 225, 225)",
      "toolbar_field": "rgba(179, 179, 179, 0.83)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgba(53, 133, 128, 0.74)",
      "popup": "rgb(146, 146, 146)",
      "popup_text": "rgb(0, 0, 0)",
      "button_background_active": "rgba(193, 193, 193, 0.53)",
      "button_background_hover": "rgba(53, 133, 128, 0.67)",
      "icons_attention": "rgba(20, 255, 211, 0.86)",
      "icons": "rgb(230, 230, 230)",
      "ntp_background": "rgb(0, 0, 0)",
      "ntp_text": "rgb(229, 229, 229)",
      "popup_border": "rgba(20, 255, 211, 0)",
      "popup_highlight_text": "rgb(255, 255, 255)",
      "popup_highlight": "rgba(55, 120, 116, 0.87)",
      "sidebar_border": "rgba(255, 255, 255, 0)",
      "sidebar_highlight_text": "rgb(255, 255, 255)",
      "sidebar_highlight": "rgba(53, 133, 128, 0.87)",
      "sidebar_text": "rgb(230, 230, 230)",
      "sidebar": "rgb(53, 53, 53)",
      "tab_background_separator": "rgba(230, 230, 230, 0.7)",
      "tab_loading": "rgb(0, 0, 0)",
      "tab_selected": "rgba(164, 164, 164, 0.81)",
      "tab_text": "rgb(0, 0, 0)",
      "toolbar_bottom_separator": "rgb(0, 0, 0)",
      "toolbar_field_border_focus": "rgba(203, 203, 203, 0)",
      "toolbar_field_border": "rgba(203, 203, 203, 0)",
      "toolbar_field_focus": "rgb(76, 130, 126)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgb(0, 0, 0)",
      "toolbar_field_separator": "rgba(230, 230, 230, 0.66)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgba(113, 113, 113, 0.66)",
      "toolbar_vertical_separator": "rgba(230, 230, 230, 0.66)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e7dbea38-6081-4a50-9023-66b3c2858331}"
    }
  }
}