Not sure which build it is exactly, as it does not start. Mozilla launched without problems when started without removing old .mozilla directory. After closing it and removing the .mozilla directory, it launches 5 processes, but does not open a window.
also reported on Solaris in bug 44590. This sounds like a dup, marking as such. The reporter of bug 44590 comments that it works again in the latest build. Can you please try this again with a newer build. and add a comment here if it still doesn't work. *** This bug has been marked as a duplicate of 44590 ***
Everything's OK again with 070710