Firefox Quantum 57 is now in beta and available to download for desktop, android and iOS. There's also a developer edition [mozilla.org]. I'm not so keen on the closer integration of Pocket, but others may be happy with that.
I used to dislike Chrome, but when I bailed from FF (for many reasons) I adapted to Chrome.
Chrome is now my default browser on all devices save one. I like the sync. Leave one device and pick up another right where I left off. And nothing comes close to the speed of Chrome.
I, like other developers, used FF for years, mostly because of the developers tool bar. But Chrome has that; an even better one IMO and the Google Publisher toolbar is an absolute must-have for Adsense.
Recent FF versions show (my testing) little difference in speeds in MOST aspects compared to other browsers (IE is still fastest in JS rendering, but that a singular aspect). If FF can double current performance over the existing build I will be impressed. Time will tell.
I standardized on all machines on FF quite a while back, and over that time it's slowly become more frustrating with crashes and incompatibility issues. Some sites cause it to freeze, or not display the content.
I'm hopeful with each new release that these issues will be resolved as it'll be a chore to switch each machine over. It's not the downloading, it's the configuring that takes the time.
I've yet to be convinced on Quantum 57, but will probably run with it. No time to test the beta right now, so if anyone else has, can you can let us know how it's gone?