ImprovedTube - Allows you to improve and enhance Youtube visually or enable dozens of new features permanently or...
Giphy - Search all the gifs and make your own animated gif
Magic Actions for YouTube - Magic Actions is an extension that changes the way you’ll watch videos on YouTube.
GIPHY Says - Turn your words into animated GIFs!
Iridium by ParticleCore - Iridium is an extension built to improve the user experience on the new YouTube Material layout.
Drop to GIF - Super simple movie to GIF conversion