VERY DANGEROUS Greasemonkey script to delete your Trakt view history in bulk.

delete_trakt_history.user.js

// ==UserScript==
// @name 				Trakt History Remover
// @namespace 	https://gist.github.com/therealzanfar
// @author 			Matthew W.
// @description Delete Trakt view history in bulk
// @version			1
// @match 			*://trakt.tv/users/*/history
// @match 			*://trakt.tv/users/*/history/*
// @run-at 			document-start
// @grant 			unsafeWindow
// ==/UserScript==

window.addEventListener("load", localMain);

var TRAKT_LOAD_DELAY = 2
var TRAKT_REMOVE_DELAY = 0.1;

var els = [];
var idx = 0;

function localMain() {
  console.log("[TRAKT] Waiting for page to finish loading...");
  setTimeout(removeElements, TRAKT_LOAD_DELAY * 1000);
}
function removeElements() {
  els = document.getElementsByClassName("grid-item");
  
  
  if (els.length > 1) {
  	console.log("[TRAKT] Found", els.length-1, "views to remove");
  	removeElement();
  }
  else {
    console.log("[TRAKT] No views found");
  }
}

function removeElement() {
  if (idx >= els.length-1) {
    console.log("[TRAKT] All elements removed, reloading page...");
    setTimeout(reloadPage, TRAKT_LOAD_DELAY * 1000);
    return;
  }
  
  var el = unsafeWindow.jQuery(els[idx]);
  console.log("[TRAKT] Removing ", el.data("history-id"));
  unsafeWindow.historyRemove(el, el.data("history-id"));
  
  idx = idx + 1;
  setTimeout(removeElement, TRAKT_REMOVE_DELAY * 1000);
}

function reloadPage() {
  document.location.reload(true);
}