Examine source code of Ponwhip

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Ponwhip",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg",
        "images/1.png",
        "images/2.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left bottom",
        "right top",
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat",
        "repeat",
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(98, 192, 180, 0.37)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(172, 208, 199)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(20, 31, 8, 0.23)",
      "toolbar_field_text": "rgb(10, 18, 10)",
      "tab_line": "rgba(237, 22, 22, 0.03)",
      "popup": "rgb(226, 226, 226)",
      "popup_text": "rgb(144, 90, 216)",
      "button_background_hover": "rgba(47, 138, 125, 0.61)",
      "icons_attention": "rgba(217, 233, 205, 0.44)",
      "icons": "rgb(255, 255, 255)",
      "ntp_text": "rgb(255, 255, 255)",
      "sidebar_border": "rgb(219, 220, 255)",
      "sidebar_highlight_text": "rgb(4, 29, 27)",
      "sidebar_highlight": "rgba(209, 77, 128, 0.44)",
      "sidebar_text": "rgb(224, 224, 224)",
      "sidebar": "rgb(143, 143, 143)",
      "tab_background_separator": "rgba(19, 65, 68, 0.98)",
      "tab_loading": "rgba(187, 250, 255, 0.98)",
      "tab_selected": "rgba(209, 77, 128, 0.18)",
      "toolbar_bottom_separator": "rgba(164, 164, 164, 0.73)",
      "toolbar_field_border": "rgba(14, 150, 201, 0.73)",
      "toolbar_field_focus": "rgba(183, 197, 202, 0.19)",
      "toolbar_field_highlight_text": "rgba(184, 48, 101, 0.18)",
      "toolbar_field_highlight": "rgba(214, 33, 103, 0.18)",
      "toolbar_field_separator": "rgba(236, 143, 179, 0.18)",
      "toolbar_field_text_focus": "rgba(12, 214, 158, 0.31)",
      "toolbar_top_separator": "rgba(209, 77, 128, 0.44)",
      "toolbar_vertical_separator": "rgba(103, 210, 255, 0.44)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8f94f0d7-937b-4a82-8901-c43639662102}"
    }
  }
}