Available in the Chrome Store
The YouTube homepage autoplays video previews anytime your mouse goes over a thumbnail. This can be very distracting while trying to browse.
This extension gives you three options for disabling that.
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DISABLE ONLY FOR SCROLLING Closest to default behavior. Video previews will play when you hover over a video, but only if you purposefully move your mouse to the video. If your mouse goes over a video while scrolling, or just lands on it after scrolling, it will not play.
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PLAY ON LONG CLICK (Recommended) Videos do not play on hover, but can be triggered by a "long click". Click and hold down on a video for a moment and the video preview will begin playing. It will keep playing until you move your mouse off the video.
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COMPLETE DISABLE Disable the video previews altogether. Do not play video previews ever.