Examine source code of WhatsApp Privacy Shield

{
  "manifest_version": 2,
  "name": "WhatsApp Privacy Extension",
  "version": "1.0",
  "description": "Blur WhatsApp chats and messages for privacy. Toggle on/off.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://web.whatsapp.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{cb1a281b-ca46-4197-b1d5-91973859c257}"
    }
  }
}