Examine source code of G-Meet Auto Join

{
  "manifest_version": 2,
  "name": "G-Meet Auto Join",
  "description": "Automatically join G-Meet meetings !",
  "version": "1.0.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "g-meet-auto-join@FirePing32",
      "strict_min_version": "57.0"
    }
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "permissions": [
    "alarms",
    "storage",
    "tabs",
    "activeTab",
    "https://meet.google.com/*"
  ],
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "browser_action": {
    "default_title": "G-Meet Auto Join",
    "default_popup": "html/popup.html"
  }
}