Examine source code of かんたん価格調査

{
  "manifest_version": 2,
  "icons": {
    "128": "icon.png"
  },
  "name": "かんたん価格調査",
  "description": "複数のネットショップの商品を一括検索、価格調査します。",
  "version": "1.8.1",
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "kkc.html",
    "default_title": "かんたん価格調査"
  },
  "permissions": [
    "contextMenus",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "jid1-3x5vhIadRiLtIQ@jetpack",
      "strict_min_version": "57.0"
    }
  }
}