Use Orbit Downloader as Youtube Downloader - How to Download Video From YouTube, Google, MySpace, MetaCafe and DailyMotion?
(1) Hover your mouse on the video, you will see a small button appeared near your mouse, like this:
(2) Click the button:
Then Orbit Downloader will pop up a dialog to fetch the video url. It will need about 2 seconds.
Soon, the "Create new download" dialog pop up. Click "OK",then the video is being downloaded.