For those who complain that it no longer works, you should know that for some reason it does not automatically update the filter list, even if it seems like it did, it does not, before entering YouTube you should go every time you close your browser at Ublock origin options and go to the "filter list" tab there, go down to where it says "uBolck filters" and press the clock icon so that the filters are updated (I recommend that you do it several times because just one time does not update completely) and then go to Youtube and it should work and if it doesn't just reload the video and that's it.
Yes, it's annoying but it works very well after that and if you don't close your browser you don't have to worry anymore all day.