JSFiddle - React, Tailwind, and code Playground

HTML

<div id="text">
</div>

JavaScript

// This piece of code trivially detects whether the PogoCheats Bot Helper 
// Chrome extension or Firefox add-on is installed.
//
// You can do this from any website, INCLUDING BING!!!
//
// This is what happens when you steal my code without knowing what the fuck you are doing, Ken. :)
const chromeUrl = "chrome-extension://fjkloikadaafjolfnhhiogalghodfkmf/scripts/block-alerts.js";
const firefoxUrl = "moz-extension://35857785-347e-4f33-bbc4-0c1984e339e4/scripts/block-alerts.js";
const xhr = new XMLHttpRequest();
let browser = "Other";

if (navigator.userAgent.indexOf("Chrome") !== -1) {
    browser = "Chrome";
    xhr.open("GET", chromeUrl, true);
}

if (navigator.userAgent.indexOf("Firefox") !== -1) {
    browser = "Firefox";
    xhr.open("GET", firefoxUrl, true);
}

xhr.onreadystatechange = function () {
    if (xhr.readyState === 4) {
        let installStatus = (xhr.status === 200);
        document.getElementById("text").textContent = "The " + (
            (browser === "Chrome")
                ? "Chrome"
                : "Firefox"
        ) + " version of PogoCheats Bot Helper is" + (
            installStatus
                ? ""
                : " not"
        ) + " installed.";
    }
};

if (browser === "Other") {
    document.getElementById("text").textContent = "Your browser does not support PogoCheats Bot Helper.";
} else {
    xhr.send(null);
}