The Download Now link will prompt a local download of the Google Chrome extension. To install the extension directly, open the file using your Chrome browser.
Play your youtube videos in Background on your PC.
This extension continuously plays Youtube search result. Go to http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager04.html. Click on the "Edit Locations" menu and a drop down menu will appear. Click "Add Location". Input "chrome-extension://" to the trustfull pages and Click "OK".