I can watch Hulu videos (from outside the US) trough Firefox (default browser) fine using the firewall method + X-Forwarded-For method that was probably documented here numerous times.
I think
GetFLV needs to focus on one browser technology and really import all of its settings like plugins but within its own browser. The bit that's missing seems to be the fact that in Firefox I'm using the "Modify Headers" plugin to spoof my country of origin, but GetFLV doesn't use the plugin in its browser
EDIT: Using Procmon, I monitored GetFLV and it seemed to be peering into my Firefox favorites -- I guess for data mining purposes LOL.