MPL-licensed addons considered free?

[Russell Currey]

Hello,

The FSF specifies that the MPL is not GPL compatible and thus isn't a 
free software license.  Why do you consider MPL-licensed addons free?

In any case, Compact Menu 2 is a brilliant addon which is MPL-licensed 
and I believe should be added to your list.  It is very popular and 
works with both IceCat and Thunderbird.  It basically reduces the Menu 
bar (File, Edit, View, etc) into a single button.

Thanks,
Ruscur