Youtube Filter Extension - Inception

There are a lot of young kids watching Youtube videos.  I went looking for the parental controls, and found Google's statement: Youtube is for people 13 and over.  To which I respond, hahahahahahaha

I thought about using a Squid proxy, but the video is encoded into a GET request, which Squid didn't seem ready to handle...

Then I saw this extension, and it looks like a good way forward...