Windows/Mac/Linux (Firefox): Firefox extension TubeStop disables autoplay on YouTube videos and blocks obtrusive overlay advertisements. Deactivating autoplay will come in handy for anyone who's followed a YouTube link and accidentally blared a video through the workplace, while the incidental overlay ad "blocking" very quickly dispenses with a new feature that a lot of avid YouTube fans aren't happy with. TubeStop works by replacing the on-site YouTube player with the embedded player you'd see on another site (which currently doesn't host ads and doesn't autoplay). TubeStop is free to download, works wherever Firefox does.
Stop YouTube Ads with TubeStop
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