A similar feature which is already available in CCleaner for IE.
I would recommend that feature available for Mozilla Firefox too.
Thanks.
Full Version: Clearing last download location for Firefox
I am pretty sure it does that, doesn't it? 
Yeah, I think so too.
Else you can use Ctrl+Shift+Del in Firefox.
Else you can use Ctrl+Shift+Del in Firefox.
This is a "lo-fi" version of our main content. To view the full version with more information, formatting and images, please click here.