I prefer Dark Background and Light Text by Mikhail Khvoinitsky: https://addons.mozilla.org/firefox/addon/dark-background-light-text/. You should try it. There are some obvious differences. And then some: - It works with internal Firefox pages. - It works with Windows High Contrast theme. - It doesn't break any add-on pop-up panel. - On facebook, it preserves original site icons.
