Remove history from Trakt

trakt-remove-history.js

// Run in console on the history page (http://trakt.tv/users/<username>/history)
// Will remove all the items, on that page, from the watched history.

$(".posters .grid-item").each(function(){
  var $this = $(this);
  historyRemove($this, $this.data("history-id"));
})

Tampermonkey version with all pages
https://gist.github.com/oc013/f0e2c2c3034c972abbc772790f69985e

// ==UserScript==
// @name         Trakt History Remover
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Clear all trakt history
// @author       You
// @match        https://trakt.tv/users/*/history
// @grant        none
// ==/UserScript==

function waitForJQuery() {
  if (typeof unsafeWindow.jQuery !== "undefined") {
    main();
  } else {
    setTimeout(waitForJQuery, 100);
  }
}

function main() {
  let $ = unsafeWindow.jQuery;

  const gridItem = $(".posters .grid-item");

  let index = 0;

  const interval = setInterval(function () {
    if (index === gridItem.length) {
      clearInterval(interval);
      window.location.reload(); // refresh the page
      return;
    }

    const $this = $(gridItem[index]);
    unsafeWindow.historyRemove($this, $this.data("history-id"));
    index++;
  }, 1500);
}

(function () {
  "use strict";

  waitForJQuery();
})();