The problem has been fixed at my edgy system with greek (el_GR.UTF-8) locale after the last apt-get update && apt-get upgrade. Now firefox starts successfuly with greek menus.
-- [edgy]Crash opening firefox https://launchpad.net/bugs/60631 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs