Basic functionality of downloading a file works, at least on the sites I tried. But you can't specify a download folder for each file--and that sucks big-time. However, you're at least supposed to be able to specify your own default folder. On the extension's main home page it says, "For Firefox browser only, you can adjust the storage location to your desired choice. To do so, please open the settings page and choose your desired folder". Big problem: there is no settings page, only the Options page, where it repeats this claim but offers no way to implement it. Major failing.

Also if listening to Internet radio for very long, after fifteen or twenty songs, the list of media stops updating. After that, if you decide you want to download a song, you're hosed. Another major failing.

Does not work on any of the sites I tried, even though other extensions like FlashGot work

Can't grab iHeartMedia streams.