This is a net increase in privacy for most people on Comcast networks, I'm glad to see Mozilla striking a deal like this -- especially with the privacy agreemen

This is a net increase in privacy for most people on Comcast networks, I'm glad to see Mozilla striking a deal like this -- especially with the privacy agreements Comcast is signing. But you should still switch your encrypted DNS provider to someone else like Cloudflare or similar. In short, good move, but you personally can make better moves than trusting Comcast.