Firefox customization: who's using "nofollow"?

From Amit’s Thoughts

Google and a bunch of other folk are now using nofollow to mark links that are not endorsed by the author of the page. I just learned that Wikipedia is using this for their external links. (I’m not convinced this is a good thing, but given that Wikipedia can be edited by anyone, it’s reasonable.) How did I learn this? By using this Firefox/Mozilla custom style sheets.

Edit chrome/userChrome.css and add this:

a[rel="nofollow"]:before {
  content: "[nofollow] ";
  color: #393;
  font-size: 8pt;
}

Now all nofollow links are marked with [nofollow]. To choose a nifty symbol instead of a word, pick a unicode symbol and use the hex code prefixed by \00 in the content: line. For example, to choose ☢, use content: "\002620";.