It's pretty. The color scheme works very nicely, and the font choices are solid. I like it.
In FF 3b5 on Ubuntu, for me, there is this oddity with the right edge of the screen... note the diagonally striped segment that pokes out at the top right and bottom right in these two screengrabs.
Ahhh, I checked it on my iMac, and I see now. I guess, if you can handle smaller resolutions, it'd be nice, but it isn't that big of a deal either. Good luck!