Examine source code of Secure Link Scanner

{
  "manifest_version": 2,
  "name": "Secure Link Scanner",
  "version": "1.0",
  "description": "Checks the safety of links on the page.",
  "permissions": [
    "activeTab",
    "notifications"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "scanner.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{de5c0601-6fee-4960-a435-7f1169cc34ac}"
    }
  }
}