Rated 5 out of 5 stars

I have been using this for a long time, mainly because it keeps the row spacing in the bookmarks list tight. I recently updated to FF4 (release), and noticed that the row spacing is a bit bigger now. I hope this can be fixed in the future, but otherwise, it's still a nice, compact theme.
Update: Found out that disabling hardware acceleration fixes the spacing issue. Under Windows, D2D seems to cause way too many font issues. So many sites looked very different, not to mention FF itself. You can do a workaround by enabling acceleration in the Tools/Options menu, but using about:config to changing gfx.direct2.disabled to TRUE. This may slow text rendering and composition down a bit, but still leave some forms of Direct 3D acceleration. Unless you have a very complicated site on a slow computer, I wonder if you'd even notice.

This review is for a previous version of the add-on (1.8.71). 

1.8.57 Rated 5 out of 5 stars

I tried to contact the author, but the links in the support screen go to a dead website.

Noticed 2 issues in 1.8.57:
When the progress bar on the bottom screen is displayed while loading a page, the bottom frame seems to expand a few pixels, then shrink back down when the page is finished and the bar is removed.
It seems as if the spacing or text size in the bookmark menus is bigger, displaying fewer bookmarks on-screen at a time.

This review is for a previous version of the add-on (1.8.57).