Colors tweets with hex color hashtags

HexTweets.user.js

// ==UserScript==
// @name     HexTweets
// @version  1
// @grant    none
// @match    https://twitter.com/*
// ==/UserScript==

var re = /^#[a-fA-F0-9]{6}$/;
var hashtags = document.querySelectorAll("div.tweet a.twitter-hashtag");
for(var i in hashtags) {
  var hashtag = hashtags[i].innerText;
  if (re.test(hashtag)) {
    hashtags[i].closest("div.tweet").style.backgroundColor = hashtag;
  }
}