I think there's a misunderstanding : the quote above does not come from Mozilla, but from one of the Digitrust people (Mitchell)

Here is the full quote :

“We know certain companies (Firefox) take the position that there is no sufficient consumer value to justify ‘tracking’ — anonymous audience recognition — of any kind, not even for use in communicating privacy choices,” Mitchell said. “They believe no third party can be trusted. We take a different position: that trust should be established directly between consumers and the brands, and publishers they trust, and with the third parties that those brands and publishers trust.”