A Greasemonkey/Tampermonkey script that will auto-inject your Guild Wars 2 API key (that must have `progression` permissions) into the "Home instance scavenger hunt" wiki page so you'll always see your progress on page load. Be sure to enter your `apiKey` into the script below.

gw2_home_instance_cats.user.js

// ==UserScript==
// @name         GW2 Home Instance Cats: API Key Injector
// @namespace    https://wiki.guildwars2.com/wiki/Hungry_cat_scavenger_hunt
// @version      0.5
// @description  Automatically injects your GW2 API key into the form in the "Hungry cat scavenger hunt" wiki page and submits it.
// @author       http://github.com/beporter
// @match        https://wiki.guildwars2.com/wiki/Hungry_cat_scavenger_hunt
// @updateURL    https://gist.github.com/beporter/561f2e95abd4327750e59467c12bf766/raw/gw2_home_instance_cats.user.js
// @grant        none
// @run-at       document-end
// ==/UserScript==

(function () {
    // Get from https://account.arena.net/applications
    var apiKey = 'GW2_API_KEY_WITH_PROGRESSION_PERMISSIONS';

    RLQ.push(function () {
        if (! document.getElementById('apikey').value) {
            document.getElementById('apikey').value = apiKey;
        }

        document.getElementById('findcats').click();
    });
})()