Works for me. All the whining on this site is why I put off the update for so long and stuck to ESR, but having tried it, I fucking hate you guys. It's incredibly fast, and there's even extensions for keyhinting--combined with key passthrough on any decent window manager, it's easily the best solution for this bloated, dystopian, js-ridden nightmare that is the modern web. And that's really the issue: the state of our web, not the browser. You can't make a good browser for something that's inherently bad, just like you can't make a good Unix op--oh, I should stop myself before the Unix weenies start having a hissie fit.
And fuck you, whoever said that FF can't be "riced". Just because your malware-infested Stylish addon can't "rice" any of FF's chrome doesn't mean that the userChrome.css doesn't still exist. Because it does, and I've basically got everything how I liked it when I left off.