Examine source code of Halo Notification Service

{
  "manifest_version": 2,
  "name": "Halo Notification Service",
  "version": "2.4.2",
  "description": "Receive Discord notifications for updates in Halo",
  "permissions": [
    "cookies",
    "storage",
    "identity",
    "*://halo.gcu.edu/"
  ],
  "minimum_chrome_version": "92",
  "background": {
    "page": "background.html"
  },
  "icons": {
    "16": "static/icon-16.png",
    "32": "static/icon-32.png",
    "48": "static/icon-48.png",
    "128": "static/icon-128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "static/icon-16.png",
      "32": "static/icon-32.png",
      "48": "static/icon-48.png",
      "128": "static/icon-128.png"
    },
    "default_popup": "popup/index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "hns@hns.com"
    }
  }
}