57 is still too slow for me. I've always disliked how long it takes firefox to go "back" to previous pages, and it still completely locks up on certain sites with certain scripts causing me to need to kill it manually. Back to Chrome. I also love Edge, but the extension support is lacking, specifically for sites that insist on autoplaying videos, something the Silent Site Sound Blocker extension takes care of on chrome.
Keep at it, firefox. I want to come back, but speed and stability are paramount.