FaceBook ya encontró la forma de darle la vuelta a ésta herramienta; antes no tenía publicidad (xxx) y ahora ya sale mucha, ojalá puedan hacer los cambios debidos. Gracias!!

Works as advertised right out of the box. Have to wait to see what it is like in the long term. Click on the icon to enable/disable it to see it in action.

It worked for a couple of days, but today sponsored blocks are in the news feed again. FF 56.0.2

AdBlocker for Facebook it does work. Firefox selling our pants to Facebook. This is why I do not trust latest Firefox versions above 43.0 Smart people should make a choice and stop blindly upgrade Firefox with out thinking consensuses . YES you are safe and with older versions of Firefox, SAFE from Facebook and other marketing monsters.
My problem this is that I can not use latest 1.8 supposedly due incompatibility with FF ver 43.