Yeah, I figured that much out.
The problem is that the browser on the N810 apparently lacks plugins to play mp3, and it even refuses to download the streamed mp3 from binairproxy.php.
It even opens the link in its own media-player (which is the crappiest thing next to WMP, perhaps). Oh, and it doesn’t even open the poster image file that displays the headphones. Peculiar.
🙄
edit:
I just installed a beta of mobile-firefox onto my n810, and it clearly has to do with the lack of a mp3-capable plugin. Oh well. Im happy with FirePlay on my N810 anywho. But The finger-friendly layout would be nice. I guess the day will come when mobile firefox will be ready, and an mplayer plugin ported. 🙂