How to download vedioes

Do you have the experience that you desire to own those funny vedioes after watching Youtube? Recently i have learned a easy way to download youtube vedioes for free. That is the download tool in the the firefox called vediodownloadhelper. After downloading it, you can have any vedioes on youtube just push the tool button. Then go to riva download the free software to play vedioes on you own computer!! It's really a good way to download anything from Youtube.