Examine source code of TownView20

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "TownView20",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(223, 231, 236, 0)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(193, 190, 255)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(255, 255, 255, 0.35)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgba(0, 255, 128, 0.2)",
      "popup": "rgb(241, 241, 255)",
      "popup_text": "rgb(0, 0, 0)",
      "button_background_active": "rgba(0, 255, 130, 0.4)",
      "button_background_hover": "rgba(255, 255, 255, 0.5)",
      "frame_inactive": "rgb(0, 255, 118)",
      "icons": "rgb(255, 255, 255)",
      "ntp_text": "rgb(0, 0, 0)",
      "popup_highlight": "rgba(151, 155, 180, 0.75)",
      "sidebar_border": "rgba(0, 255, 130, 0.25)",
      "tab_loading": "rgb(0, 184, 45)",
      "tab_selected": "rgba(255, 255, 255, 0.5)",
      "toolbar_bottom_separator": "rgb(255, 255, 255)",
      "toolbar_field_border_focus": "rgba(0, 255, 130, 0.2)",
      "toolbar_field_border": "rgba(0, 255, 130, 0.2)",
      "toolbar_field_focus": "rgba(241, 241, 255, 0.5)",
      "toolbar_field_highlight_text": "rgb(0, 0, 0)",
      "toolbar_field_highlight": "rgba(151, 155, 180, 0.8)",
      "toolbar_field_separator": "rgba(0, 0, 0, 0)",
      "toolbar_field_text_focus": "rgba(0, 0, 0, 0.8)",
      "toolbar_top_separator": "rgba(255, 0, 0, 0)",
      "toolbar_vertical_separator": "rgba(255, 0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3cea4ea5-a2b1-4fb7-8b67-b7a6f2045cfb}"
    }
  }
}