That's rather odd. I use VLC for just about everything. For listening to music for long periods of time I use Rhythmbox as its playlists are better and such. Think if VLC as being like Winamp; small, light, plays lots of stuff. Think of Rhythmbox like iTunes; database-based library search, extensive playlist features.
EDIT: Really, if you want to just migrate a Firefox profile from a Windows installation you can just copy the profile directory from one to another. It'll bring along all your extensions (assuming they aren't Windows-specific, which most aren't), all of your themes, and all of your bookmarks.