Hover a thumbnail at its bottom part and move the mouse horizontally to view the actual screenshots from the video
< 脚本 YT: peek-a-pic 的反馈
This author has another excellent script
https://greasyfork.org/zh-CN/scripts/9252-fyte-fast-youtube-embedded-player
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This author has another excellent script
https://greasyfork.org/zh-CN/scripts/9252-fyte-fast-youtube-embedded-player