Greasy Fork is available in English.
Shows complete video thumbnails for YouTube videos. You can click a thumbnail image to jump to that point in the video.
< Обсуждения: YouTube Thumbnails - Full Video Thumbnails for YouTube
Thanks for the heads up. Looks like youtube removed that method. I've just posted an update that should work again. Please test it out.
getUpdatedConfigurationData is no longer available
getUpdatedConfigurationData is no longer available in new Youtube update, try incognito mode.