laziest-fb-cleaner.user.js

// ==UserScript==
// @name        World's Laziest FB Cleaner
// @namespace   gm.cha0s
// @description Checks if there's suggest post bullshit on your FB feed once a second. Nukes it with prejudice.
// @include     https://www.facebook.com/
// @version     1
// @grant       none
// ==/UserScript==

(function() {

  var FACEBOOK_STUPID = '._5g-l';
  
  window.setInterval(function() {

    var elms = document.querySelectorAll(FACEBOOK_STUPID);
    for (var i in elms) {
      var node = elms[i];
      for (var j = 0; j < 4; ++j) {
        node = node.parentNode;
      }
      node.style.display = 'none';
    }  


  }, 1000);

})();