Examine source code of PapaMeet

{
  "manifest_version": 2,
  "name": "PapaMeet",
  "version": "1.3",
  "description": "Joins and quits meetings automatically.",
  "icons": {
    "48": "index.jpg"
  },
  "permissions": [
    "activeTab",
    "storage",
    "notifications"
  ],
  "browser_action": {
    "default_icon": "index.jpg",
    "default_title": "PapaMeet",
    "default_popup": "index.html"
  },
  "background": {
    "scripts": [
      "./browser-polyfill.js",
      "./background.js"
    ]
  }
}