Examine source code of Clouds and sunset / 日落下的云

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Yide",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "repeat-y"
      ]
    },
    "colors": {
      "toolbar": "rgba(92, 101, 110, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(92, 101, 110)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(249, 249, 249, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(92, 101, 110, 0)",
      "popup": "rgb(62, 90, 108)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgba(92, 101, 110, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8f17ef72-1847-4be0-8a44-7986bb227027}"
    }
  }
}