I can still block content in any way I see fit on Gecko-based applications, not so much on Blink-based things. There are many things about Firefox-the-browser and Mozilla-the-organisation which could do with an overhaul but as it stands it is still my go-to browser. I only use Blink-based things to test and for those (annoying) sites which insist on it in which case I first try Bromite, then Ungoogled Chromium. If it still does not work it is not worth visiting. I do not have Chrome installed on any device and have never felt I was missing out.

This just isn't true, have look through https://mozilla.github.io/standards-positions/ and check the authors of some of the proposals Mozilla are negative about.

There's even a post on front page right now about Mozilla's position on the very proposal we are discussing: https://news.ycombinator.com/item?id=36857032