Examine source code of CleanSignUps Email Verifier

{
  "manifest_version": 3,
  "name": "CleanSignUps Email Verifier",
  "description": "Extract and validate emails using CleanSignUps API",
  "version": "1.0.2",
  "browser_specific_settings": {
    "gecko": {
      "id": "cleansignups@example.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "collects_personal_data": false,
        "collects_health_data": false,
        "collects_financial_data": false,
        "collects_location_data": false,
        "collects_user_activity": false,
        "collects_web_history": false,
        "collects_crash_data": false
      }
    }
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_popup": "popup.html"
  },
  "options_page": "options.html",
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ]
}