Ytmp3.cc - By using our converter you can easily convert YouTube videos to mp3 (audio) or mp4 (video) files and download them for free - this service works for computers, tablets and mobile devices.
Enhancer for YouTube - Tons of features to improve your user experience on YouTube™!
OnlineVideoConverter.com - OnlineVideoConverter.
Turn Off the Lights - With a single click on the lamp button, the page will fade to dark.
MP3 Converter - Mp3 Converter is a free to use as YouTube to MP3 converter that allows you to convert and download YouTube to MP3, MP4, F4V and 3GP formats.
Magic Actions for YouTube - Magic Actions is an extension that changes the way you’ll watch videos on YouTube.