freeware means free (of charge), not open source, and as far as I'm aware, is not redistributable either. Then there's stuff like shareware, which is redistributable, almost always free, but not specifically open source. A product is also allowed to be open source but not free or redistributable. To complicate things further, software can be free, open source, and/or redistributable, but it doesn't mean the libraries or extensions used by the software also apply. Firefox is really difficult to ACCURATELY classify because it isn't 100% free, open source, or redistributable. That's where iceweasel comes in, which is supposed to be all of those things.