Is Firefox really free?

There seems to be a debate rising about weather or not Mozilla Firefox is really free enough, in this case the debate is weather Firefox is free enough to be distributed with Debian.
Mozilla has been cracking down on its trademark being used on merchandise and other items in decent times ever since the Mozilla Foundation was started back in June, it would also seem that the new Firefox artwork is not Open-Source and cannot be used on unoffical builds or those not authorised by the Mozilla Foundation.