Allows you to define a message to be passed as content for a new thread, Xenforo already provides query parameters for the thread title and the prefix but not the post itself.
create a file here: /js/custom/prefill.js with this content:
JavaScript:
XF.ready(() => {
const params = new URLSearchParams(window.location.search);
const content = params.get('content');
if (!content) return;
const decodedContent = decodeURIComponent(content.replace(/\+/g, ' '));
const...