This extension helps you managing your donwloads. If enabled any download gets it own subdirectory inside the download directory. This subdirectory gets the name of the domain where the download comes from. If enabled you can use a whitelist. Then only those downloads get a subdirectory which domain is listed. Additionally you can use defined shortkeys to open the last download (default Alt+L) and open the default download directory (default Alt+O). You can change this settings in the Chrome extension menu at the very bottom.