A new filesharing extension has been released for Firefox.
It's called AllPeers and it's described as "the strength of Firefox combined with the efficiency of BitTorrent".
"The heart of AllPeers is the Navigator, a sidebar that provides rapid access to all the information managed by AllPeers. Since AllPeers is by nature an extensible platform, the Navigator needs to be extensible as well. That's why you see the buttons at the bottom for changing the view ("My Peers" and "My Media")," reads the AllPeers website.