How to download Video from youtube

Many time we have been into situation where we watch a video and we will not be able to download that video for future reference. Here is a simple procedure to download the videos from websites like Youtube.com, Metacafe.com etc.

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1.  First of all you need to have Firefox browser as it has the ability to install many third party Addons.
2. Once you have Firefox installed on your computer. You need to download the add-on called
   Video download helper. 
3. Once the addon is downloaded, Click on the Firefox icon on the left top corner and goto Add-on                                                               
4. Click on Setting Icon as show below in the Picture and click on "Install Add-on from file"   
5. Now Select the Video Download Helper file which was downloaded earlier. Now the Addon should be added to your browser. Please restart the Firefox by closing and reopening the browser.
6. Now go ahead with the your usually browsing and when ever you find a video which you need to download. Just click on the Video download helper Icon which will be located to left of the Address bar or Right click on any of the free space on the webpage and select Video download helper. And the video on the webpage will be download instantly.