This photo-album pops up a "view" window when you click a thumbnail. Clicking anywhere in this window closes it again. Opening another thumbnail should pop up a new window, but Mozilla fails to do this. When exiting Mozilla, a zombie process keeps running in the background that has to be killed.
In the meantime, marking WORKSFORME. firstname.lastname@example.org: please try the site again with a recent build. If it works OK now, you can mark this bug "Verified". Otherwise, you can reopen it - thanks.