Correction: its available for Maemo 4.0 / N810 combination. The above FTP link is for Chinook. I see someone with Diablo complaining. Well, tough luck, the browser wasn't build for Diablo (yet). Not my decision, I'd opt for Diablo, but OK, its still sad someone put 3 hours into a Chinook software for running it on Diablo... so beware!
Um, why would it need to be built for Diablo? The only major library change was libssl, Chinook and Diablo are 99% compatible.
Hmm I see although works is relative. These milestones are pre alpha. Xulrunner is big (20+ MB), there are installation/deinstallation problems, its rather slow, and it crashes. We'll see. By the time N900 is out its probably stable and usable...
the current one is labeled 0.9pre. It's actually quite stable. renders *significantly* faster than MicroB, with near instantaneous zoom. There are still some UI issues, though, many of which relate to the onscreen keyboard. You can tell right now that once this is polished it's going to be much better than microb.