Examine source code of my_search_extensions

{
  "manifest_version": 2,
  "name": "my_search_extension",
  "version": "2.2.0",
  "description": "選択文字列に対して、各種検索、翻訳、URLとみなして開く、などを実行できます。",
  "permissions": [
    "activeTab",
    "tabs",
    "contextMenus",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ba431a71-e1a7-42f8-91f0-d8bbe5ea900b}"
    }
  }
}