Examine source code of White

{
  "manifest_version": 2,
  "version": "4.0",
  "name": "White",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 255, 255, 0)",
      "toolbar_text": "rgb(153, 153, 153)",
      "frame": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(153, 153, 153)",
      "toolbar_field": "rgba(227, 227, 227, 0.15)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(0, 0, 0)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(0, 0, 0)",
      "button_background_active": "rgb(153, 153, 153)",
      "button_background_hover": "rgb(153, 153, 153)",
      "icons": "rgb(0, 0, 0)",
      "tab_loading": "rgb(0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d0e9cf0d-5439-471d-a461-1388050a4555}"
    }
  }
}