How to block the annoying “Before you continue” popup on Google?

Just block all of the cookies for the page where you see this popup and voilà.

Add the following JavaScript to your browser through an extension (like Tampermonkey for Chrome, or Firefox):

// ==UserScript==
// @name         avoid Google's "before you continue"
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  How to block the annoying “Before you continue” popup on Google?
// @author       jonas
// @url          https://stackoverflow.com/a/63999294/1153476
// @match        https://www.google.com/*
// @grant        none
// ==/UserScript==


const style = document.createElement('style');

style.innerHTML = /* css */ `
  html {
    overflow: auto !important;
  }
  
  .gTMtLb > div[class=""] {
    display: none !important;
  }
`;

document.head.append(style);

In Tampermonkey, in script Settings page, you can set Run at to document-start, otherwise the popup will be visible for a brief moment.