ImprovedTube - Allows you to improve and enhance Youtube visually or enable dozens of new features permanently or...
Enhancer for YouTube - Tons of features to improve your user experience on YouTube™!
Magic Actions for YouTube - Magic Actions is an extension that changes the way you’ll watch videos on YouTube.
Minimal YouTube - Minimal YouTube is an extension that replaces the YouTube UI with a minimal design containing no recommendations, shorts, or distractions.
Turn Off the Lights - With a single click on the lamp button, the page will fade to dark.
niconico-yt - NicoNico-style comments on YouTube.