Just tried the subtunes server from a CentOS/3.6-2.el5 system running FF 3.6.13. Most of the issues I was seeing fom my Windows 7 computer are gone! The list and coverflow both work. The searching is still slow (and there is no feedback to let me know its working and not to keep pushing Enter), but it works. As for the HTML5 audio, I noticed that on both platforms it won't start playing until I toggle the "Use HTML5 Audio" radio button once. Until I do, I have a small (~200px x 200px) white box in the upper left corner of the screen. I was also having an issue playing the first song in an album. The interface didn't recognize my selection. Any other track would work correctly.
On an interesting note, I did get subtunes to start playing about 5 songs simultaneously! I don't think it registered the song switch completely, and kept playing the previous song after starting the new one.
Nice little mod! Thanks for sharing it with the community. There are some rough edges that could use some buffing out to make it my default subsonic frontend, but the design is certainly appealing.
-JesterEE