Examine source code of マイナポータル

{
  "name": "マイナポータル",
  "description": "様々なオンライン行政サービスで、マイナンバーカードを利用するためのアプリケーションです。",
  "manifest_version": 2,
  "version": "36.1.0.0",
  "browser_action": {
    "default_icon": {
      "38": "images/icon38.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "mpa.addon@mpa.cao.go.jp",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://mposs.force.com/*",
        "https://*.go.jp/*",
        "https://*.e-shishobako.ne.jp/*",
        "https://*.lg.jp/*",
        "https://*.e-taxrenkei.jp/*",
        "https://aizuwakamatsu.mylocal.jp/*",
        "https://*.mypg.jp/*",
        "https://*.onshikaku.org/*",
        "https://*.online-web-development.net/*",
        "https://nsa.pref.nara.jp/*",
        "https://*.su-mynote.jp/*",
        "https://www.msc-kumamoto.jp/*",
        "https://*.libe-mypg.jp/*",
        "https://www.msc-ehime.jp/*",
        "https://www.msc-tochigi.jp/*",
        "https://www.okayama-musubi.jp/*",
        "https://www.ems-kagawa.jp/*",
        "https://www.msc-nagasaki.jp/*",
        "https://*.smart-cert.d-secure.jp/*",
        "https://www.msc-tottori.jp/*",
        "https://www.online-a.com/*",
        "https://api-smartlife-pf.com/*"
      ],
      "run_at": "document_end",
      "js": [
        "MPA_Content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "MPA_Background.js"
    ]
  },
  "permissions": [
    "nativeMessaging",
    "activeTab"
  ]
}