hmm. ublock origin no longer seems to reliably work on youtube for me. unfortunate!
manage extensions> ublock origin> meatball menu> options> my filters> paste the following:
youtube.com##+js(set, yt.config_.openPopupConfig.supportedPopups.adBlockMessageViewModel, false)
youtube.com##+js(set, Object.prototype.adBlocksFound, 0)
youtube.com##+js(set, ytplayer.config.args.raw_player_response.adPlacements, [])
youtube.com##+js(set, Object.prototype.hasAllowedInstreamAd, true)
then hit "apply changes"













