There seems no way to search Hulu from the Chrome omnibox, because it no longer fills the search bar using the `?q=query` param. This script resolves that issue.

hulu-chrome-omnibox-search-fix.tamper.js

// ==UserScript==
// @name         Hulu fill search input from query params
// @namespace    https://y4kstudios.com
// @updateUrl    https://gist.github.com/theY4Kman/6e3680fdd5383992aeee5f3f4312dd8d/raw/e6d247c5e60d3411408f59faa82cdd833b84dac4/hulu-chrome-omnibox-search-fix.tamper.js
// @version      0.1
// @description  There seems no way to search Hulu from the Chrome omnibox, because it no longer fills the search bar using the `?q=query` param. This script resolves that issue.
// @author       You
// @match        https://www.hulu.com/search?*
// @grant        none
// ==/UserScript==

function entrypoint() {
    function setNativeValue(element, value) {
        const valueSetter = Object.getOwnPropertyDescriptor(element, 'value').set;
        const prototype = Object.getPrototypeOf(element);
        const prototypeValueSetter = Object.getOwnPropertyDescriptor(prototype, 'value').set;

        if (valueSetter && valueSetter !== prototypeValueSetter) {
            prototypeValueSetter.call(element, value);
        } else {
            valueSetter.call(element, value);
        }
    }

    function triggerUpdate(element) {
        element.dispatchEvent(new Event('input', { bubbles: true }));
    }

    function setReactInputValue(element, value) {
        setNativeValue(element, value);
        triggerUpdate(element);
    }

    function waitFor(fn, interval) {
        return new Promise((resolve, reject) => {
            const timerId = setInterval(() => {
                const rval = fn();
                if (rval) {
                    resolve(rval);
                    clearInterval(timerId);
                }
            });
        }, 50);
    }

    function waitForElement(selector) {
        return waitFor(() => document.querySelector(selector), 50);
    }

    function main() {
        const params = new URLSearchParams(window.location.search);
        const query = params.get('q');

        if (query) {
            waitForElement('.cu-search-input').then(searchInput => {
                waitFor(() => Object.getOwnPropertyDescriptor(searchInput, 'value'), 50).then(() => {
                    setReactInputValue(searchInput, query);
                });
            })
        }
    }

    main();
}

(function() {
    'use strict';

    const script = document.createElement('script');
    script.appendChild(document.createTextNode('('+ entrypoint +')();'));
    (document.body || document.head || document.documentElement).appendChild(script);
})();