Today it totally stopped working and all the ads are back on You Tube and every other site. And yes, it's still enabled. I'm using Chrome and Firefox with a Linux OS.
Also have been using this for a long time. Some sites hate it more than adblock and won't even load content at all when you have it on yahoo mail in particular messes with you for it.Adblock sucks, they have too much bloat and too many white listed ads.
Use Ublock to block everything with less resources used up so your computer runs faster.