Examine source code of smug-kagami

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "kagami",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right bottom"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(127, 127, 127, 0.41)",
      "toolbar_text": "rgb(248, 233, 254)",
      "frame": "rgb(154, 114, 205)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(67, 67, 67)",
      "tab_line": "rgb(248, 233, 254)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(67, 67, 67)",
      "tab_loading": "rgb(248, 233, 254)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{563f03dd-b98d-40de-b741-e4bbbc7294bd}"
    }
  }
}