500px: Mark followers in following list

console.js

// open followers popup

var followers = [];

jQuery('.follower_modal .actor .name').each(function(i, el){
  followers.push(jQuery(el).attr('href'))
});

// close followers popup
// open following popup

jQuery('.follower_modal .actor .name').each(function(i, el){
  var $el = jQuery(el);
  var href = $el.attr('href');
  
  if (followers.includes(href)){
    $el.addClass('my-follower');
  } else {
    $el.addClass('not-my-follower');
  }

});