UPDATE: This feature has been completely removed from Firefox with release of version 26. If you would like to use a functional downloads manager, you can try DownThemAll!.
Today was the day when I finally decided to upgrade to the latest versions of everything. Which of course included Firefox. What I instantly noticed after starting up a new version was this tiny new button for opening the downloads window:
Oh, that’s a good idea. Now I don’t have to look for my downloads in the menu.
The excitement vanished instantly when I saw the monstrosity they have turned the downloads window into.