hn-black.user.js

// @name          HN Black Font
// @description   Make text black on HN
// @homepage      https://gist.github.com/1600378/
// @match         https://news.ycombinator.com/*
// @match         http://news.ycombinator.com/*
// @run-at        document-start
(function() {
  var css, head, node;
  css = "td { color: #000000; }";
  
  try {
    head = document.getElementsByTagName("head")[0];
    node = document.createElement("style");
    node.type = "text/css";
    node.appendChild(document.createTextNode(css));
    head.appendChild(node);
  } catch (err) {}
}).call(this);