I had the same installation problems.

I finally installed it from here: http://moff.mozilla.com/latest-beta/

I choosed to install the QT version (maemo5-gtk/ 06-Oct-2010 20:46) which should be the latest available build.

It works ok, kept my 1.1 addons

Seems a bit faster than 1.1, and a bit more stable. I like it better than the previous versions, but imo, still doesnt beat MicroB