Thanks very much for the additional info, Bob and Pol!
I wasn't aware that ABE was going to be discontinued in June. For the time being anyway, I re-installed ABP. From what I've read at Mozilla's site, ublock, (at this time) has only been reviewed "preliminarily" by them, & it indicates ublock is still in beta.
Being my tech abilities/understanding of applications like ublock doesn't come anywhere close to either of yours, I'll just be one of those conservative "unicorns" you referred to Pol, and stay with ADP for the time being. (And continue monitoring the comments here and at Mozilla about ublock's development).
Best regards!
Pete