Limits height of posts or signatures and imposes scrollbars on posts which break that limit
// ==UserScript==
// @name Scratch Forum Scrollbars
// @version 1.0
// @namespace iamunknown2
// @description Limits height of posts or signatures and imposes scrollbars on posts which break that limit
// @include https://scratch.mit.edu/discuss/topic/*
// ==/UserScript==
var post = document.getElementsByClassName("post_body_html")[0];
post.style.maxHeight = "300px";
post.style.overflowY = "auto";
post.style.paddingRight = "10px";
var signature = document.getElementsByClassName("postsignature")[0];
signature.style.overflowY = "auto";
signature.style.paddingRight = "10px";