All software *directly* from Mozilla have a trademark policy applied to them that restricts one of the essential freedoms. Trademark policies aren't agains the free software philosphy, but just as we evaluate licensing issues, we also consider that some trademark policies go too far.
In the case of software coming *directly* from Mozilla, their trademark policy forbids you to exercise freedom 2 (to redistribute copies of the original work both commercially and non-commercially), because their trademark policy denies you from selling the original software[1]. [1]: http://www.gnu.org/software/for-windows.html#f2
