Ignore user-specified style in mail and news

[Warren Bell]

I saw this at mozilla.org (http://www.mozilla.org/unix/customizing.html)
where you can specify rules in your personal stylesheet to block HTML
formatting in incoming mail and news messages.  Is this somthing that's
still being worked on? I put the example they gave in my userContent.css
and it doesn't work.

/*
 * Ignore user-specified style in mail messages.
 * See http://bugzilla.mozilla.org/show_bug.cgi?id=18427 for details.
 */
.text-html font, .text-html div, .text-html body {
  font-size: inherit !important;
  font-family: inherit !important;
  color: inherit !important;
  background-color: inherit !important;
  background-image: inherit !important;
  text-align: inherit !important;
  text-indent: inherit !important;
}