Did you configure the proxy using Firefox's Options->Advanced->Network->Settings...? When I configured a proxy using this method I logged in to filesonic.jp and then I was able to download files with urls containing filesonic.jp or www.filesonic.com using the web browser, but once I removed the proxy I could no longer download because the urls were being redirected to www.filesonic.com.
I also configured a japanese proxy for DownloadStudio and I was able to download filesonic.jp urls but not www.filesonic.com urls.
After some testing it appears that DownloadStudio is finding the redirect url filesonic.jp and is getting the correct cookie, but the request is being redirected back to www.filesonic.com again.
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