github_usernames.js

last_page = false
usernames = []

function nextPage(lastPage=false) {
  newUsernames = Array.from(document.querySelectorAll('.user-list-item>div>div>a')).map(a => a.innerText)
  usernames = usernames.concat(newUsernames)
  lastPage = document.querySelector('.next_page').className.split(' ').indexOf('disabled') != -1

  if(!lastPage) {
    setTimeout(() => {
      document.querySelector('.next_page').click()
      setTimeout(nextPage, 3000)
    }, 1000)
  } else {
    window.localStorage.setItem('usernameArray', JSON.stringify(usernames))
  }
}
nextPage()