I downloaded it, because I have an intense dislike for Safari (it just doesn't seem to do what I want it to do, the way I want it to. Ever) and Firefox is wonderful normally, except for the constant crashes and needs for restarts...
Normally, I'd be happy to write a short review of the browsers features and how it felt to use etc. But in this case, the product is quite simply unfinished. Bookmarks organiser (EG the ability to delete a bookmark) is missing, as are a variety of other features. For example, I unchecked "always show the bookmarks bar" thinking that would turn on an auto-hide effect, which would be handy, but no; Turning off "always show" hides it, and as the option to turn this on again is hidden in the View menu option, this at first seems permanent.
I will check out a later release I think. For now, this is worse than useless.