I think you're misleading in quoting a two-year old blog, then closing off with "ooops", implying that Mozilla was caught in a privacy-related oops.
When in fact, Mozilla was super duper clear in the blog about the privacy implications of this experiment. And in the past two years, they have been focusing more and more on the privacy angle.
At the moment, both Safari and Mozilla look to me to be leading in privacy.
