This Add-on now requires their "Companion app" to be installed on your PC (outside of Firefox) in order to download anything! And that's in addition to installing the Browser Add-on (in Firefox)! This Add-on use to be great. Now it's garbage! Sorry. Until they allow you to download stuff with just the browser Add-on again (Without requiring extra software in addition to just the Add-on), This Add-on will forever remain uninstalled! User's beware!