Online videos from YouTube, Viddler, and Vimeo are used more and more to present content for training. It's distracting to have the inappropriate comments of internet trolls appear when you use the videos for learning. To remove them, show your videos using quietube.com and watch in peace.
There is no installation, just drag the button on the page to your browser's toolbar. When you are on the video's page, click the button to clean up the page and view just the video. You can even make short URLs to send the quietube version to others.