OnlineVideoConverter.com - OnlineVideoConverter.
ImprovedTube - Allows you to improve and enhance Youtube visually or enable dozens of new features permanently or...
ClipConverter.cc - ClipConverter.
Enhancer for YouTube - Tons of features to improve your user experience on YouTube™!
VidToMP3.com - VidToMP3.
Magic Actions for YouTube - Magic Actions is an extension that changes the way you’ll watch videos on YouTube.