The first try on loading that url causes Mozilla to detect a application/octet-stream, file unrecognized by netscape. Press cancel, e try reload that same url and all now works fine...
loads fine for me first time on win32 071008 mozilla build
I don't see this bug on Linux build ID 2000-071221 A tiny extra browser window appears, with a commercial, which is as it should be.
The page loads fine on first try with build 2000-071211 on Linux.