Examine source code of Mackerel-Kitten 1

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Mackerel-Kitten1",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0)",
      "toolbar_text": "rgb(230, 230, 230)",
      "frame": "rgb(86, 66, 52)",
      "tab_background_text": "rgb(230, 230, 230)",
      "toolbar_field": "rgba(226, 170, 131, 0.3)",
      "toolbar_field_text": "rgb(230, 230, 230)",
      "tab_line": "rgba(255, 255, 255, 0.17)",
      "popup": "rgb(86, 66, 52)",
      "popup_text": "rgb(230, 230, 230)",
      "button_background_active": "rgba(226, 170, 131, 0.4)",
      "button_background_hover": "rgba(255, 255, 255, 0.25)",
      "icons_attention": "rgb(230, 230, 230)",
      "icons": "rgb(230, 230, 230)",
      "ntp_text": "rgb(0, 0, 0)",
      "popup_border": "rgba(255, 255, 255, 0.6)",
      "popup_highlight_text": "rgb(255, 255, 255)",
      "popup_highlight": "rgba(255, 255, 255, 0.17)",
      "sidebar_border": "rgba(255, 255, 255, 0.6)",
      "sidebar_highlight_text": "rgb(255, 255, 255)",
      "sidebar_highlight": "rgb(86, 66, 52)",
      "sidebar_text": "rgb(230, 230, 230)",
      "sidebar": "rgb(86, 66, 52)",
      "tab_background_separator": "rgba(255, 0, 0, 0)",
      "tab_loading": "rgb(255, 255, 255)",
      "tab_selected": "rgba(167, 149, 127, 0.65)",
      "tab_text": "rgb(0, 0, 0)",
      "toolbar_bottom_separator": "rgba(226, 170, 131, 0.4)",
      "toolbar_field_border_focus": "rgba(255, 255, 255, 0)",
      "toolbar_field_border": "rgba(255, 255, 255, 0.17)",
      "toolbar_field_focus": "rgb(104, 77, 50)",
      "toolbar_field_highlight_text": "rgb(0, 0, 0)",
      "toolbar_field_highlight": "rgba(255, 255, 255, 0.25)",
      "toolbar_top_separator": "rgba(255, 0, 0, 0)",
      "toolbar_vertical_separator": "rgb(230, 230, 230)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c31ffb75-7830-47e9-bde2-c2d08398f97e}"
    }
  }
}