TubeLister - Generate a YouTube playlist from your opened tabs.
you-tldr - Get the tldr of any YouTube video in seconds
Tuned Rocks📺 - Discover🔎 curated Youtube videos 24/7
SliceTube - The Fast and Modern way to cut and download YouTube videos
Vidlis - Create music playlists from YouTube videos.
GIFit! - Quickly turn YouTube videos into GIFs (chrome extension)