Howdou for Google Classroom

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "version": "5.2.0",
  "name": "__MSG_extension_name__",
  "description": "__MSG_extension_description__",
  "manifest_version": 3,
  "default_locale": "en",
  "background": {
    "service_worker": "service-worker.js"
  },
  "action": {
    "default_icon": {
      "48": "img/icon48.png",
      "64": "img/icon64.png",
      "128": "img/icon128.png",
      "256": "img/icon256.png",
      "512": "img/icon512.png"
    },
    "default_title": "Howdou Classroom Integration",
    "default_popup": "def_pop.html"
  },
  "icons": {
    "48": "img/icon48.png",
    "64": "img/icon64.png",
    "128": "img/icon128.png",
    "256": "img/icon256.png",
    "512": "img/icon512.png"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "css": [
        "styles.css"
      ],
      "js": [
        "content.js"
      ],
      "matches": [
        "https://classroom.google.com/*"
      ],
      "run_at": "document_end"
    }
  ]
}