Mozilla's origins stem from the ashes of Netscape and the decision to "Open Source" the browser was a tactical solution rather than an ethical one. In fact, the very term "Open Source" originated from Netscape's licensing decision in the late 90's. Taking this into account the move to embed Digital Restrictions Management on the client side is hardly surprising.

Concurrently, this is the same company that wanted to place ads in browser "to benefit users" only to find out the end users didn't want this pervasive intrusion of privacy.

https://blog.mozilla.org/futurereleases/2014/05/09/new-tab-experiments/