I switched back to Firefox 54 from Chrome when multiprocess browsing ("Electrolysis") came out of beta. It's been absolutely great. It's fast and I trust and like the nonprofit behind it. And all the extensions I care about are available. My main issue with Chrome was the endless nags to sign in to a Google account, and just generally wanting less dependence on Google. I also like that Firefox has a built in tracking…
Thanks for the reminder. I just downloaded the latest FF beta and exiled Chrome to an "only when needed" role. All the back-and-forth about speed and features is understandable, but misses the point that Firefox needs our support if we are to have any real non-proprietary options for what is quickly becoming the base system abstraction layer for most computing.
It feels exactly like Chrome (it's Chromium-based), but has a built-in adblocker, tracker blocking, HTTPS everywhere, no nagging to sign in, and does not throw "suggested news" (with no opt-out) upon you. Brave's founder is ex-Mozilla's CEO (Brendan Eich).
However latest FF on Android is actually not bad, at least if you have a modern phone (the UI feels slowish though on pre-2016 phones).