Once the whole file is loaded on the browser, look in the root of /tmp for the file with the funky gibberish name (j-whatever, usually). Copy that somewhere, then give it an FLV extension. Terminal command: mplayer -dumpaudio foo.flv -dumpfile foo.mp3 To check quality, it’s file foo.mp3 (I didn’t specify, but mine came out as 128/44).

P.S. Riva FLV Player works fine under Wine. 🙂