Tampermonkey/Greasemonkey: Automatically filter out horror games from itch.io

Less Horrific Itch.js

// ==UserScript==
// @name        Remove Horror From Itch
// @match       *://itch.io/*
// @run-at      document-start
// @grant       none
// @description add exclude horror filter to all itch.io pages
// ==/UserScript==

var oldUrlPath = window.location;


var url = new URL(oldUrlPath);
if(url.host.toLowerCase() == "itch.io"){
    console.log("is itch");
    if(url.searchParams.has("exclude")){
        console.log("already has exclude");
    }else{
        console.log("has no exclude");
        url.searchParams.set('exclude', "tg.horror");
        var newURL = url.href
        window.location.replace (newURL);
    }
}