Chrome extension to automatically click the "Send SMS" button on okta.com

contentScript.js

/* 
 * The purpose of this script is to automatically click the "Send SMS"
 * button as soon as the page is loaded, instead of clicking on it manually.
 *
 * This is the page with the button:
 *
 *    https://partnershealthcare.okta.com/signin/verify/okta/sms
 *
*/

// Run main() after the page is loaded
window.addEventListener('load', main, false);
function main(event) {

  // Every 1000 ms, run try_click()
  var timer = setInterval(try_click, 1000);
  // Stop trying after 10 attempts.
  var max_attempts = 10;

  function try_click() {
    max_attempts -= 1;
    if (max_attempts > 0) {
      clearInterval(timer);
      console.log("Attempts left: " + max_attempts);
      // Find the button.
      var b = document.querySelector(".sms-request-button");
      // If we found the button, click on it.
      if (b) {
        max_attempts = 0;
        console.log("Clicking on sms button");
        b.click();
      }
    }
  }
}

manifest.json

{
  "name": "autoclick",
  "version": "1.0",
  "manifest_version": 2,
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://partnershealthcare.okta.com/*"
      ],
      "js": ["contentScript.js"],
      "css": ["mycss.css"]
    }
  ]
}

mycss.css

body {
  background: linear-gradient(#9198e51c, #e6646538) !important;
}