Examine source code of Add Doc to Classroom

{
  "browser_specific_settings": {
    "gecko": {
      "id": "{f6fd42a7-ffb4-4917-8cab-baa766046be9}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "manifest_version": 3,
  "name": "Add Doc to Classroom",
  "version": "2.0.0",
  "description": "Share the current page to Google Classroom with one click.",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_title": "Share to Google Classroom",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab"
  ]
}