How to add a download tab button on Youtube page for Google Chrome

&q=youtube+downloader+google+chrome

Music The Path of the Goblin King by Kevin MacLeod
Source :http://incompetech.com link of the script has changed to ...

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The video with titled How to add a download tab button on Youtube page for Google Chrome published by quicktipsto with Channel ID UCS5OpnSTJy_Q-DRI4MhQf8Q At 14 07 2013 - 10:24:32