I don't mean to be nasty, so I gave three stars, but in fact I found the add-on useless and uninstalled it after ten minutes. With uBlockOrigin installed, all I need to do on YouTube is a page refresh for the adblock warning to go away and the video to play. This is still less of a hassle than having to step through a number of ads, however fast. And this add-on doesn't affect the static ads under the player window in any way, which I find intolerable.