Extract Emails from Gmail current page using the browser console

getEmailsFromGmail.js

// Make sure you load the url that you are looking to get the emails from
// right from the beginning, so if you are looking to search something, do
// the search and then refresh to load just the data of the right url
// Example: https://mail.google.com/mail/u/0/#search/job+position

console.log([...document.querySelectorAll('span')]
  .filter((el, idx) => el.getAttribute('email') && idx % 2 === 1)
  .map(el => el.getAttribute('email')));