Enhancer for YouTube - Tons of features to improve your user experience on YouTube™!
Gifox - Delightful GIF Recording and Sharing App for macOS
Iridium by ParticleCore - Iridium is an extension built to improve the user experience on the new YouTube Material layout.
Giffing Tool - Giffing Tool is simply put: The fastest creator of high quality captioned GIFs available.
Magic Actions for YouTube - Magic Actions is an extension that changes the way you’ll watch videos on YouTube.
Instagiffer - Create GIFs from anything!