It works fine but every day I have to save the daily limits because it doesn't update the next day. I mean, whenever I start a day it tells me that I already used all the time I had for Youtube.
I set it to count from 8am but it keeps counting from 12am.

It's quite annoying so I uninstalled the extension.
Otherwise it works perfect, maybe it's because I have FMulti-Accounts Containers but I don't know.