Testing out Firefox Aurora, what are the new features for it?

I lost a bit of addons, but surprisingly, the ones I use the most, Web of Trust, NoScript, AdBlock Plus, FireFTP, Download Manager Tweak, Ghostery, Fire.fm, EVERYTHING that I actually use daily is still working. I don't see an increase in speed, as right now I'm also testing out Opera Next in Ubuntu 11.04, and they both run perfectly well. *So on a side note, if you know what else is new in Opera Next, please inform me* So, I experienced a nice speed boost from Firefox 4 to Firefox 5, but none from Firefox 5 to Firefox 6 Alpha, Aurora. What type of things are new, besides about:permissions ?