If you compare it with Chrome it's hard to say. But if you just want to use Firefox (because speed is not everything), the difference between 57 and 56 is huge.

If you compare it with Chrome it's hard to say. But if you just want to use Firefox (because speed is not everything), the difference between 57 and 56 is huge. I spent 15 minutes just opening sites at random to enjoy the speed :). On the other hand, the addons took a big hit, most of my addons aren't supported anymore. And it seems that everybody is searching for equivalents, as http://addons.mozilla.org/ http://addons.mozilla.org/ seems to throw nginx errors right now.