AppleScript (P.S - Thx Adam JS love))

tokenExtractSafari

tell application "Safari"
	tell window 1
		set current tab to make new tab with properties {URL:"https://facebook.com/adsmanager"}
		delay 5
	end tell
	do JavaScript "var re = new RegExp('access_token\"?:\"(.*?)\"');
  var m = document.documentElement.innerHTML.match(re);
  
  function copyToClipboard(text){
      var copytext=document.createElement('input')
      if(typeof text=='undefined') copytext.value=window.location.href
      else copytext.value=text
      document.body.appendChild(copytext)
      copytext.select()
      document.execCommand('copy')
      document.body.removeChild(copytext)
  }
  
  m[1] !== 'undefined' ? (copyToClipboard(m[1]), alert('Токен скопирован в буфер обмена')) : alert('Токен не найден. Перейдите в facebook.com/adsmanager');" in document 1 -- document 1 is the current tab of the front window
end tell