Everything said in that article makes me very happy to have switched to Firefox.
Google can dress this up all they want, but a happy byproduct of this (for them) is that they can now purposefully ignore rules/filtering for their own sites, such as youtube, since it puts the real control of such filtering with the browser (and the company who created it) instead of the extension. Yes there is a trust concern with extensions. And yes, there is a performance hit with extensions vetting each network call. But that’s the price we, as the user, should continue to have the power to choose to pay, but Google is forcing us to go their way.