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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "checker.js"
      ],
      "css": [
        "checker.css"
      ],
      "matches": [
        "http://mail.google.com/*",
        "https://mail.google.com/*"
      ]
    }
  ],
  "description": "__MSG_ext_desc__",
  "icons": {
    "128": "icon8-6.png"
  },
  "name": "__MSG_ext_name__",
  "version": "0.28.1",
  "manifest_version": 3,
  "default_locale": "ja"
}