Examine source code of URL Verifier

{
  "manifest_version": 3,
  "name": "URL Verifier",
  "description": "Verify the authenticity of URLs, helping alert users against accessing malicious sites, and other online threats.",
  "version": "2.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "urlverifier@example.com"
    }
  },
  "permissions": [
    "activeTab"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_icon": {
      "16": "shield.png",
      "48": "shield.png",
      "128": "shield.png"
    },
    "default_popup": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}