Greasy Fork is available in English.
Instant video previews in popup player by hovering or clicking video thumbs. Video ratings and resolution data shown on the thumbs. Gets video information without using a YouTube API key, which can be banned or limited.
< Opinie na YouTube Video Preview and Ratings Keyless
On search results the video preview button disappears when you hover over a thumbnail with youtube's video preview enabled.
This doesn't happen on channel pages even with youtube's video preview.