I'm actually very saddened by this. What are the alternatives? Use chrome/chromium or other blink powered browsers and let google have it's way with the web?
I wish some organizations like Tor will fork firefox and absorb these talent, then I can contribute whatever I can afford monthly to it, knowing that anything I contribute will be going to the betterment of the web than into incompetent management. Maybe they can start a kickstarter campaign or something, I will definitely contribute.
There's still Epiphany and Midori as Webkit-based browsers, but you're gonna lose Web Extensions, Service Workers by default, nice dev tools, and a lot of things in the process.