Rated 5 out of 5 stars
Very useful and well done extension.
There is a non-documented feature: this addon deletes downloaded files that are 1 day old or older when firefox starts.
The only thing this addon is missing is configuration where user can select the default folder where the files should be downloaded to. Right now it's hard coded to download into %TEMP%\mozOpenDownload\ folder
It also would be nice have an option to select how long the files should be kept before being deleted.
Still the addon deserves 5 stars without these features :)