As we all know that Firefox 57 will rename to Firefox Quantum. It means the New version Firefox will use Quantum Engine instead the old one.
Even throgh Firefox 57 is still in beta,but we can install it from PPA under Ubuntu.
sudo add-apt-repository ppa:mozillateam/firefox-next sudo apt-get update sudo apt-get install firefox
So here it is.
After play for hours,I found the Quantum version is MUCH FASTER than old version.
But some extensions may not work. For example,Greasemonkey,Autoproxy,Foxyproxy etc.That's not a big deal for me,I'm happy with new version Firefox,I've only installed two extensions:SwitchyOmega and Ublock Origin.
If you don't care much about extension-support,Just try it.