Examine source code of Win7 Login

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Win7 Login",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(119, 145, 159, 0)",
      "toolbar_text": "rgb(0, 59, 75)",
      "frame": "rgb(0, 167, 255)",
      "tab_background_text": "rgb(0, 44, 59)",
      "toolbar_field": "rgba(255, 255, 255, 0.54)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgba(255, 255, 255, 0)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgba(0, 0, 0, 0.7)",
      "button_background_active": "rgba(255, 255, 255, 0.77)",
      "button_background_hover": "rgba(255, 255, 255, 0.47)",
      "tab_selected": "rgba(255, 255, 255, 0.65)",
      "toolbar_top_separator": "rgba(255, 255, 255, 0)",
      "tab_loading": "rgba(255, 255, 255, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1c51838a-f149-4cf4-8a58-98e21b2de1c4}"
    }
  }
}