Examine source code of TOTP Authenticator

{
  "name": "TOTP Authenticator",
  "version": "5.0",
  "description": "Get OTP instantly from your device.",
  "permissions": [
    "storage",
    "activeTab",
    "identity",
    "notifications",
    "clipboardWrite",
    "clipboardRead"
  ],
  "host_permissions": [
    "https://totpauthenticator.firebaseapp.com/*",
    "https://*.binaryboot.com/*",
    "https://*.firebaseio.com/*",
    "https://apis.google.com/*"
  ],
  "homepage_url": "https://www.binaryboot.com/case_study/totp",
  "background": {
    "scripts": [
      "firebase-app-compat.js",
      "firebase-database-compat.js",
      "firebase-auth-compat.js",
      "forge.min.js",
      "background.js"
    ]
  },
  "action": {
    "default_icon": "assets/images/app_icon128.png",
    "default_popup": "index.html"
  },
  "icons": {
    "16": "assets/images/app_icon16.png",
    "32": "assets/images/app_icon32.png",
    "48": "assets/images/app_icon48.png",
    "128": "assets/images/app_icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.binaryboot.com/*"
      ],
      "js": [
        "assets/js/connect.firefox.js"
      ]
    }
  ],
  "manifest_version": 3,
  "web_accessible_resources": [
    {
      "resources": [
        "assets/images/app_icon32.png"
      ],
      "matches": [
        "https://*.binaryboot.com/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{98e69bc7-6003-4522-865c-34f3ee5653e3}"
    }
  }
}