Examine source code of LinkedImageDownloader

{
  "manifest_version": 2,
  "name": "LinkedImageDownloader",
  "version": "0.03beta",
  "description": "表示されている画像やリンク先の画像を一括保存します。",
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html"
  },
  "background": {
    "scripts": [
      "background-script.js"
    ]
  },
  "permissions": [
    "menus",
    "downloads",
    "activeTab",
    "tabs"
  ]
}