I found this site accidently this week while searching for something else but the idea is fantastic. Quietube allows you to add a button to your toolbar so that when you find a YouTube or other video online you can clean out the advertising and present a clean copy of the video without seeing inappropriate content.
It is easy to add to Firefox just drag the button, however it wasn’t so easy in Internet Explorer so I put together a small video to make it easier. Check it out to see what it looks like as well.