Mozilla is so bad at selling their users' trust. Betrayal of trust aside, they really should at least evaluate the incident (read: scandal) rate per ads served, which is currently higher than most notorious advertisers...
https://news.slashdot.org/story/18/12/31/2219257/mozilla-says-ad-on-firefoxs-new-tab-page-was-just-another-experiment
The social network of the future: No ads, no corporate surveillance, ethical design, and decentralization! Own your data with Mastodon!