LaTeXhk.js

// ==UserScript==
// @name        LaTeXhk
// @namespace   LaTeXhk
// @include     /^https?:\/\/2ch\.(hk|pm|re|tf|wj)/sci/
// @version     1
// @grant       GM_getValue
// @grant       GM_setValue
// @grant       GM_xmlhttpRequest
// ==/UserScript==


mathJaxOpt = document.createElement('script');
mathJaxOpt.type = 'text/x-mathjax-config';
mathJaxOpt[(mathJaxOpt.innerText===undefined?"textContent":"innerText")] = 'MathJax.Hub.Config({tex2jax: {inlineMath: [[\'$\',\'$\']]}});';
document.getElementsByTagName('head')[0].appendChild(mathJaxOpt);
mathJax = document.createElement('script');
mathJax.type = 'text/javascript';
mathJax.src = "https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML";
document.getElementsByTagName('head')[0].appendChild(mathJax);