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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "portal_extension",
  "version": "1.0",
  "description": "This is a portal extension for students.",
  "action": {
    "default_popup": "portal.html"
  },
  "icons": {
    "16": "images/koutei_16.png",
    "48": "images/koutei_48.png",
    "128": "images/koutei_128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://service.cloud.teu.ac.jp/portal/index*"
      ],
      "js": [
        "portal.js"
      ]
    }
  ]
}