Gives me a screen that says Ad blockers are not allowed

After using a dozen youtube customizers on firefox and other browsers, gotta say - this is the best one I've found BY FAR

la mejor y mas completa extension. es intuitiva, agradable y cumple con el 99.9% de las exigencias. gracias.

This is what youtube should offer for Customization is pretty, easy to install, has LITERALLY endless custom option with custom scripts and feels awesome right out the box