(function(send) {
        XMLHttpRequest.prototype.send = function() {
            console.log('ajax');
            send.apply(this, arguments);
        };
    })(XMLHttpRequest.prototype.send);

{
  "manifest_version": 2,
  "name": "Sender",
  "version": "1",
  "permissions": [
    "tabs",
    "activeTab",
    "http://*/*",
    "https://*/*",
    "storage",
    "downloads"
  ],
  "icons": {
    "48": "48x48.png"
  },
  "background": {
    "scripts": [
      "jquery.js",
      "bg.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*",
        "http://*/*"
      ],
      "js": [
        "cryptojs.js",
        "jquery-3.3.1.min.js",
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_title": "Open",
    "default_icon": "48x48.png",
    "default_popup": "popup.html"
  }
}