hide-thirsty.php

<?php
/**
 * Hides the thirsty link buttons
 */
function fsb_admin_hide_ta_mce_button(){
  if( get_post_type() == 'post' ){
      echo '<style>.mce-toolbar .mce-btn-group .mce-btn.ta-add-link-button + .mce-btn {display: none;}</style>';
  }
}
add_action( 'admin_head', 'fsb_admin_hide_ta_mce_button' );