Page Theming Rated 4 out of 5 stars
I love it, except for a couple of minor details.. On the pages it themes (xml in particular) all links are light blue, making it impossible to tell whether or not I've already visited them. Also, there are cases where the page's background overrides the theme, making it difficult to read. I would prefer a light version which only skinned the browser interface and left everything else alone. Other than this, I absolutely love this theme. Awesome work!
UPDATE: I contacted the author, Stefano, who was more than happy to address the issue. Anyone wishing to have the fixes immediately should visit: https://addons.mozilla.org/en-US/firefox/addon/ft-deepdark/versions/.