Thanks for the heads-up. I did not knew that, but it seems to be no specifically new problem, but a very old one. Quick first research shows complaints from 2014, and before, for example:
http://lifehacker.com/adblock-plus-o...ase-1576341872
https://betanews.com/2014/05/15/is-a...-firefox-down/
Note that Adblock can more than double, can increases
by factors memory usage of FF.