Download youtube videos Easy and Quick

Here is an add-on from Firefox which helps you to download you tube videos directly from the browser with out any additional software.

Go through the link and click on "add to Firefox".

 Easy youtube video downloader from mozilla

or directly click below to install plugin

               Easy youtube video downloader plugin

Restart the Firefox you will have to able to see "Download" button at the bottom of every video which you view in youtube.