Download Youtube Videos With Greasemonkey Script

 Install this addon first : https://addons.mozilla.org/en-US/firefox/addon/greasemonkey/
After that go to : http://userscripts.org/scripts/show/25105 and install the script.

The video from the picture above :

Video of Field WegGL experiment in chrome beta browser, recorded with XVidCap on Debian linux desktop. Music from Sacred Spirit : Dawa ( The cradlesong )