I just thought, this theme is OK, but sorry it isn´t, either. If you wish to add a page to your bookmarks and open the folder drop-down menu, the right edge of that window is cut away if you run your machine with a resolution of 800x600. The only theme being able to support 800x600 seems to be the ugly default theme of FF5.
If you really want to use another theme than the default, please contact the author from the theme of your preference, describe the problem, provide some feedback like screenshots, steps to reproduce the problem and so on. I'm sure every theme developer would be happy to help in solving your problem. And again and again and again, this is not the place for bug reports or features requests.