Windows 7 - WHERE do podcasts get saved to in Win 7?

I have downloaded several podcasts in .mp3 format from the NPR radio sites. ( I am new to the world of podcasts,) so I just clicked on the website's "download now as mp3 files" button. I have no idea where those podcasts are stored either by default or by someone other than me telling it where to be stored. (I used Mozilla Firefox to get to the NPR sites, if that matters.) I've searched on every conceivable key word and I've checked directory after directory and a gazillion folders. I've read the Windows 7 Forum postings about podcasts, too. Most postings indicated that somenone sets up the target location, but it wasn't done by me. My PC runs as a 64-bit Windows 7 Home Premium computer and it was all set up for me by a company, which has since folded, so I can't call them. Do you have any ideas about where else I can check for these downloaded mp3 files?
Thanks.