To restore animated thumbnail previews, requires inline video previews to be disabled in your YouTube user settings. Note: not Greasemonkey compatible. v3 Add fix for new youtube update to sidebar vids; remove carousel fallback.
< 腳本Restore animated thumbnail previews - youtube.com的回應
Thanks for the report and it's a shame that YouTube is making these breaking changes for some users, probably it will gradually roll out to affect us all. I have just released a new version that has a fall back for the homepage to show a still image carousel, which I think is better than nothing but unfortunately I can't restore the animated thumbs to the homepage without unacceptable issues affecting search history (see other comment thread).
I hope this is seen as an improvement over no animated thumbnails on the homepage, but if not it can be disabled by editing the below line or reverting to v1.0
<>const forceDisableNewHomepageMethod = false;
toconst forceDisableNewHomepageMethod = true;
Stopped working for me about a week ago. Seems to still work everywhere except the home page.