hide-facebook-comments/hide-facebook-comments.js

// ==UserScript==
// @name     Hide Facebook Comments
// @version  1
// @grant    none
// @run-at   document-start
// @match    https://*.facebook.com/*
// @license  GNU General Public License v3.0 only
// @supportURL https://gitlab.com/zyphlar/hide-facebook-comments
// @contributionURL https://gitlab.com/zyphlar/hide-facebook-comments
// @compatible firefox
// @namespace https://greasyfork.org/users/236588
// @description COMMENTS CONSIDERED HARMFUL: We all know the phrase "don't read the comments," and yet we do. Squash these pesky varmints once and for all with this helpful UserScript.
// ==/UserScript==

"use strict";


function hideComments() {
  setInterval(doCommentHiding, 10000);
}

function doCommentHiding(){
  hideElementsByClassName("UFIList"); // page comment box
  hideElementsByClassName("comment_link"); // page comment link
  hideElementsByClassName("_ipm");
  hideElementsByClassName("_3w53");
  hideElementsByClassName("_68wo");
  hideElementsByClassName("_666h"); // profile comment box
  hideElementsByClassName("_1bqu"); // <user> commented on your post.
  hideElementById("pagelet_ego_pane");
  hideElementById("pagelet_dock"); // bottom dock and notifications
  hideElementsBySelector("fbNotificationsFlyout li[data-gt*='feed_comment']"); // comment notifications 
  hideElementsBySelector("div[data-testid='fbSnowliftUFI/feedbackSummary']"); // gallery comment count
  hideElementsBySelector("div[data-testid='UFI2CommentsList/root_depth_0']"); // gallery comments
  //console.log("Hid");
}

function hideElementById(id) {
  var e = document.getElementById(id);
  if (e) {
    e.style = "display: none;";
  }
}

function hideElementsByClassName(name) {
  var e = document.getElementsByClassName(name);
  for (var i=0;i<e.length;i++) {
    e[i].style = "display: none;";
  }
}

function hideElementsBySelector(selector) {
  var e = document.getElementById(id);
  if (e) {
    var f = e.querySelectorAll(selector);
    for (var i=0;i<f.length;i++) {
      f[i].style = "display: none;";
    }
  }
}

hideComments();

window.addEventListener("load", hideComments);