Examine source code of Web Recon

{
  "manifest_version": 2,
  "name": "Recon: SainiON • crt.sh → Wayback",
  "version": "1.0",
  "description": "Passive recon tool using crt.sh and the Wayback Machine archives. Extract subdomains, archived URLs, paths, and sensitive file types. Powered by SainiON Hacks.",
  "permissions": [
    "activeTab",
    "storage",
    "<all_urls>"
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Recon: SainiON",
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    "results.html",
    "results.js",
    "results.css",
    "saini_logo.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "recon@sainionhacks.addon",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}