Mozilla's CMO already defended their behavior in a statement to Gizmodo [1], claiming in effect that the malware they silently injected into people's browsers didn't harm people's privacy, and thus was OK. Mozilla's CMO believes that Mozilla did nothing fundamentally wrong.
That shows a cultural disconnect between Mozilla's management and Firefox users.
Privacy is one important feature, but trust is what was violated here.
[1]: https://gizmodo.com/mozilla-slipped-a-mr-robot-promo-plugin-...