Literally does not work for Youtube, however Adblock Ultimate available free here on Firefox addons does. I'm not sure who's making all these fake 5 star reviews, it's probably Google / Youtube staff.

Does not work

https://addons.mozilla.org/fr/review_guide

Generally, Adblock Plus works except when I want to create an exception. It blocks the exception.

Cela a toujours été impécable

Youtube does not work anymore with adblock, so I switched to ublock.