Get a pre-filled link for Google Forms.

forms-filler.user.js

// ==UserScript==
// @name        Forms Filler
// @namespace   https://micorksen.eu
// @version     1.0
// @description Get a pre-filled link for Google Forms.
// @author      Micorksen
// @match       https://docs.google.com/forms/*
// @icon        https://gstatic.com/images/branding/product/2x/forms_2020q4_48dp.png
// @require     https://code.jquery.com/jquery-3.6.3.slim.min.js
// @grant       GM_setClipboard
// ==/UserScript==

'use strict';
$(function () {
  $('div.lRwqcd').append('<div role="button" class="uArJ5e UQuaGc Y5sE8d VkkpIf QvWxOd" jscontroller="VXdfxd" jsaction="click:cOuCgd; mousedown:UX7yZ; mouseup:lbsD7e; mouseenter:tfO1Yc; mouseleave:JywGue;touchstart:p6p2H; touchmove:FwuNnf; touchend:yfqBxc(preventMouseEvents=true|preventDefault=true); touchcancel:JMtRjd;focus:AHmuwe; blur:O22p3e; contextmenu:mg9Pef;" jsshadow="" jsname="M2UYVd" tabindex="0" id="forms-filler"><div class="Fvio9d MbhUzd" jsname="ksKsZd"></div><div class="e19J0b CeoRYc"></div><span jsslot="" class="l4V7wb Fxmcue"><span class="NPEfkd RveJvd snByac">Copy pre-filled link</span></span></div>')
  $('#forms-filler').on('click', function () {
    let v = [],
      u = `${window.location.origin}${window.location.pathname}?`
      
    $(this)
      .addClass('M9Bg4d')
      .addClass('qs41qe')
    
    setTimeout(function () {
      $('#forms-filler')
        .removeClass('M9Bg4d')
        .removeClass('qs41qe')
    }, 250)

    $('input[type="hidden"][name^="entry."]').each(function () {
      const e = $(this)
      v.push(`${e.attr('name')}=${encodeURIComponent(e.attr('value'))}`)
    })

    u += v.join('&')
    GM_setClipboard(u, 'text')
    alert('Copied link to the clipboard.')
  })
})