Examine source code of Jay PMS WhatsApp Bridge

{
  "manifest_version": 3,
  "name": "Jay PMS WhatsApp Bridge",
  "version": "1.0.4",
  "description": "Sends WhatsApp messages queued by Jay PMS",
  "icons": {
    "128": "icon.png"
  },
  "permissions": [
    "alarms",
    "storage",
    "tabs",
    "scripting",
    "activeTab"
  ],
  "host_permissions": [
    "http://127.0.0.1:5150/*",
    "http://localhost:5150/*",
    "https://web.whatsapp.com/*"
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://web.whatsapp.com/*"
      ],
      "js": [
        "selectors.js",
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "Jay PMS Bridge",
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{26A33832-91E8-4F42-9DDD-61E6CD34B009}",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}