Click on the icon and you get a Show all downloads button. Hit that and the Library window opens onto your download queue and history.
I hardly see how Mozilla believes "you can monitor, view and locate downloaded files without having to switch to another window..." since that's exactly what you need to do!
While this is an improvement over the previous version - the embedded indicator and time estimate being useful features - as you can see it is still rather clunky in use.
The Firefox Download Manager as it comes out-of-the-box remains a very basic utility; don't compare it to fully featured download managers. Pause and resume don't work as well as third-party tools and other options are limited.
The new Download Manager does make downloading files with Firefox easier, but it's an incremental improvement. RC