When in Japan

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "When in Japan",
  "description": "和暦に西暦を併記します",
  "version": "1.0.1",
  "manifest_version": 3,
  "content_security_policy": {
    "extension_pages": "script-src 'self' ; object-src 'self'; ",
    "sandbox": "sandbox allow-scripts allow-forms allow-popups allow-modals; script-src 'self' 'unsafe-inline' 'unsafe-eval'; child-src 'self';"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "wheninjapan.css"
      ],
      "js": [
        "jquery-3.7.1.js",
        "wheninjapan.js"
      ],
      "run_at": "document_end",
      "all_frames": false
    }
  ]
}