I am using FF 52 ESR. And this will stay because FF 57 blocks some of my Add-Ons!
And ABP updatet without reason to the new unusable version!
I had to deinstall ABP and to install the latest good version.
And this will stay for all time! I don't need a total overloaded slower Firefox with now unusable ADD-Ons. Firefox gets slower with each new version.
And the old ABP was/is one of my best ADD-ONs!