Steam. Clear ignored games list on https://store.steampowered.com/account/notinterested/

steam_clear_ignored_games.js

resetQueue();
var PAUSE_INTERVAL = 500; //Wait for this many milliseconds between each request
 
function resetQueue() {
    //Perform initial request
    jQuery.get("https://store.steampowered.com/dynamicstore/userdata/", {t: new Date().getTime()}, function(data) {
        // @xorbis: The data.rgIgnoredApps is now an object, should use Object.keys(data.rgIgnoredApps) instead.
        var totalItems = data.rgIgnoredApps.length;
        if (totalItems == 0) {
            alert("There are no items in your Not Interested list.");
            return;
        } else {
            var approval = confirm("About to remove " + totalItems + " games from your Not Interested list, proceed?");
        }
        if (!approval) {
            return;
        }
        removeItem(0, data.rgIgnoredApps);
    }, "json").fail(function() {
        console.error("There was an error retrieving your Discovery Queue");
    });
}
 
function removeItem(i, applist) {
    if (i >= applist.length) {
        alert("All items cleared from Not Interested list.");
        return;
    }
   
    jQuery.ajax({
        url: "https://store.steampowered.com/recommended/ignorerecommendation/",
        type: "POST",
        data: {sessionid: g_sessionID, appid: applist[i], remove: 1, snr: "1_account_notinterested_"},
        success: function() {
            console.log((i + 1) + "/" + applist.length + " items removed");
            setTimeout(function() {
                removeItem(i + 1, applist);
            }, PAUSE_INTERVAL);
        },
        error: function() {
            console.error("Request failed, your Steam session id is probably incorrect/invalid, reload the page and try again");
        }
    });
}

Here's a fixed version that works with TamperMonkey

// ==UserScript==
// @name         New Userscript
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        https://store.steampowered.com/account/notinterested/
// @icon         https://www.google.com/s2/favicons?domain=steampowered.com
// @grant        none
// ==/UserScript==

resetQueue();
var PAUSE_INTERVAL = 500; //Wait for this many milliseconds between each request

function resetQueue() {
    //Perform initial request
    jQuery.get("https://store.steampowered.com/dynamicstore/userdata/", {t: new Date().getTime()}, function(data) {
        // @xorbis: The data.rgIgnoredApps is now an object, should use Object.keys(data.rgIgnoredApps) instead.
        var totalItems = data.rgIgnoredApps.length;
        if (totalItems == 0) {
            alert("There are no items in your Not Interested list.");
            return;
        } else {
            var approval = confirm("About to remove " + totalItems + " games from your Not Interested list, proceed?");
        }
        if (!approval) {
            return;
        }
        removeItem(0, Object.keys(data.rgIgnoredApps));
    }, "json").fail(function() {
        console.error("There was an error retrieving your Discovery Queue");
    });
}

function removeItem(i, applist) {
    if (i >= applist.length) {
        alert("All items cleared from Not Interested list.");
        return;
    }

    jQuery.ajax({
        url: "https://store.steampowered.com/recommended/ignorerecommendation/",
        type: "POST",
        data: {sessionid: g_sessionID, appid: applist[i], remove: 1, snr: "1_account_notinterested_"},
        success: function() {
            console.log((i + 1) + "/" + applist.length + " items removed");
            setTimeout(function() {
                removeItem(i + 1, applist);
            }, PAUSE_INTERVAL);
        },
        error: function() {
            console.error("Request failed, your Steam session id is probably incorrect/invalid, reload the page and try again");
        }
    });
}