57 don't hit stable till mid November!
I've been using 57 on Android for weeks now, and am encouraged by the results so far. I'm not having issues with updated extensions I like, or found great alternatives. My point is, ITS STILL BETA! As of today, and has 6 weeks yet to smooth out the wrinkles. I've used 55 concurrently, and I have definitely noticed the increase of speed. So, as a fan, I'm inclined to give them the benefit of doubt.
With that said, I use multiple browsers, just because, none are perfect.But Firefox is definitely my primary used.